Frequently Asked Questions

Circadian offers a 60-night sleep trial on every pillow, with no restocking fee. Sleep on it for up to 60 nights, and if it is not the right fit, return it for a full refund to your original payment method. The trial gives your body time to adapt to a natural material, which moves and feels differently from synthetic foam.

Circadian backs every pillow and both duvets with a 60-night sleep trial and no restocking fee. If the pillow is not right within 60 nights, email jacob@circadianrest.com, we send a prepaid return label, and the refund goes back to your original payment method within 3 to 5 business days of the pillow reaching the New Jersey workshop. Exchanges for a different fill, size or firmness work the same way, with any price difference adjusted. There is no minimum number of nights and no condition beyond normal use.

Yes. Circadian ships free on every order within the contiguous United States, with no minimum. Alaska, Hawaii, Puerto Rico, Guam and the other US territories are a flat $25, and international orders ship at a flat rate that checkout shows once you enter your address.

Circadian ships from New Jersey, where every pillow is made to order by hand. Most orders leave the workshop in 4 to 7 business days, larger pieces like duvets and body pillows in 7 to 12, and checkout shows the arrival window for your address before you pay. The fills come from farms and forests around the world (buckwheat from US farms, wool from New Zealand, kapok from Indonesia, latex from Sri Lanka), and every pillow is filled and sewn in New Jersey.

Circadian pillows are handmade in New Jersey, USA, in a workshop that has been making pillows since 1981. The Organic Cotton Pillow and Organic Wool Pillow are GOTS Certified Organic as finished pillows, the material inside as well as the cover, under license GOTS-10229 issued by Oregon Tilth. Every other pillow has an organic cotton cover over a natural fill that sits outside that certification.

Yes. Circadian accepts bulk and wholesale orders for hotels, retreats, and resellers. Contact customer service through the website to request pricing and minimums.

Reach Circadian customer service through the contact form at circadianrest.com. Responses typically arrive within one business day, Monday through Friday.

Circadian offers a subscriber discount for new email sign-ups, available on the homepage at circadianrest.com. Any active seasonal promotions or codes appear in the site's announcement bar. There is no permanent sitewide discount code.

Circadian offers six natural pillow fills: USA-Grown Buckwheat hulls, the Buckwool Hybrid (buckwheat plus wool), Wild-Harvested Kapok, Organic Cotton, Organic Wool, and shredded slow-pour Dunlop latex (the Tree-Tapped Latex Pillow). A waterproof organic cotton pillow protector is also available separately.

Every Circadian pillow comes in Standard (20 by 26 inches), Travel (12 by 16 inches), Queen (20 by 30 inches) and King (20 by 36 inches). The Body size (20 by 72 inches) is a separate product, the Circadian Body Pillow, made in four fills: Organic Cotton, Organic Wool, Wild-Harvested Kapok and Tree-Tapped Latex. The Waterproof Organic Cotton Pillow Protector comes in all five sizes, Travel through Body.

Yes. Every Circadian pillow arrives full, about 30 percent more inside than most people keep, and has a zippered opening, so you take some out and set your own height on the first night. Refills are sold separately for every fill, buckwheat hulls, kapok, organic cotton, organic wool and latex, if you want to add some back later.

Nothing gets a chemical treatment at any stage. Flame retardants, formaldehyde finishes and synthetic dyes are all absent for the same plain reason, which is that the workshop does not run any of those processes, and there is no polyurethane foam in any Circadian pillow. The Organic Cotton Pillow and Organic Wool Pillow are GOTS Certified Organic as finished pillows, license GOTS-10229, issued by Oregon Tilth, which means every input used on them is on an approved list rather than merely not banned. The latex fill in the Tree-Tapped Latex Pillow is OEKO-TEX Standard 100 Class 1 certified, the strictest tier, used for infant-skin-contact products, which confirms the latex has been tested for over 100 harmful substances.

The Organic Cotton Pillow and Organic Wool Pillow are certified organic through both fill and cover, made in accordance with GOTS. OTCO, licence GOTS-10229. The latex fill in the Tree-Tapped Latex Pillow is OEKO-TEX Standard 100 Class 1 certified, and its rubber-tree source in Sri Lanka is FSC certified. All other pillows use an organic cotton cover.

GOTS certification on a finished product means the whole pillow has been audited through the supply chain, from the farm to the final stitch. Circadian's Organic Cotton Pillow and Organic Wool Pillow carry that full certification, made in accordance with GOTS, OTCO, licence GOTS-10229, and so do both duvets and the pillow protector. The other pillows use an organic cotton cover, but because the buckwheat, kapok and latex fills sit outside that certification, those pillows are not certified as finished products. The cover is still organic cotton either way.

Yes. Circadian sells US-grown buckwheat hull refills in resealable bags. Refills let you top up firmness over time as the hulls naturally settle, without buying a new pillow.

Yes. Every Circadian pillow arrives about 30 percent fuller than most people keep it, so the first adjustment is usually taking some out through the side zipper. Refill bags are sold separately for all five fills, buckwheat hulls, kapok, organic cotton, organic wool and Tree-Tapped Latex pieces, so you can add material back later as the pillow settles or your preferences change.

Unzip the side zipper, take material out until the pillow sits at your preferred height, then zip it closed. Circadian pillows arrive full, so most people take some out on the first night. For buckwheat, store any removed hulls in a sealed container or bag so you can add them back later. For kapok and latex, hand-fluff what is left after adjusting so it spreads evenly.

Take the material out through the zipper before washing anything. The organic cotton cover is machine washable on a cold gentle cycle, then tumble dry low or air dry. The material inside never goes in the water. Buckwheat hulls, kapok, cotton, wool and latex are all spot-cleaned only and aired in sunlight to refresh, because washing mats wool and cotton and breaks latex down. A pillow protector is the easiest way to keep the material clean in the first place.

Lifespan depends on fill. Slow-pour Dunlop latex lasts up to a decade, the longest in the lineup. A load of buckwheat hulls gives three to five years before it needs replacing. Organic wool runs three to five years before the fill needs significant replenishing, and organic cotton two to four years before the fibre needs full replacement. Refills are available for every fill, so most pillows can be topped up rather than replaced.

Kapok is the soft, fluffy fiber that grows inside the seed pods of the Ceiba pentandra tree in Indonesia. The pods ripen, split and fall, and the floss is gathered from the ground, so the tree is never felled to harvest it. Each fiber is a hollow tube roughly 80 to 90 percent air by volume, which is why the Circadian Wild-Harvested Kapok Pillow feels down-like and lets your warmth pass through instead of holding it. It is plant-based, so the pillow is vegan, and the fiber composts at the end of its life.

Most Circadian pillows avoid the things that commonly cause reactions in bedding. Buckwheat, kapok, and organic cotton contain no animal proteins and no synthetic chemicals. On the wool pillows, lanolin keeps dust mites out and wool holds the air around your head too dry for dust mites to settle in. The Tree-Tapped Latex Pillow is not suitable for anyone with a latex allergy, which is a hard contraindication, so choose buckwheat, kapok, or cotton instead.

Circadian pillows avoid the synthetic chemicals and animal proteins behind most pillow allergies. Buckwheat hulls and kapok fiber hold almost no moisture, and dust mites and mold both need moisture to get going. Organic cotton and wool fills skip flame retardants and synthetic off-gassing, and on the wool pillows lanolin keeps dust mites out. If you have a wool sensitivity, avoid the Organic Wool and Buckwool Hybrid. If you have a latex allergy, avoid the Tree-Tapped Latex Pillow entirely, since natural latex proteins are a hard contraindication.

If you have a wool allergy or sensitivity, choose the Circadian Buckwheat, Wild-Harvested Kapok, Organic Cotton, or Tree-Tapped Latex Pillow. Avoid the Organic Wool and Buckwool Hybrid, which both contain wool fill. All Circadian pillow covers are made from organic cotton with no wool content.

If you have a diagnosed latex allergy, avoid the Tree-Tapped Latex Pillow. Latex allergy is triggered by proteins in Hevea brasiliensis rubber that remain in the material even after processing. The safe Circadian options are the Organic Cotton, Wild-Harvested Kapok, Organic Wool, USA-Grown Buckwheat, or Buckwool Hybrid Pillow.

Every Circadian pillow is a single natural fill inside an organic cotton cover, with no polyurethane foam, flame retardants, formaldehyde, or synthetic dyes, so there is nothing in it left to off-gas. If you are choosing bedding to keep household chemicals out of the air at your face, the Buckwheat and Organic Cotton pillows are the cleanest in the range. For anything medical, your doctor is the right person to ask.

The Circadian Organic Wool Pillow is the strongest choice for allergy sufferers. Lanolin keeps dust mites out, and wool holds the air around your head too dry for dust mites to settle in. The Wild-Harvested Kapok Pillow is the next choice, a hollow plant fibre with no animal proteins and no chemical processing. Both are treatment-free and come in an organic cotton cover. If you have a latex allergy, avoid the Tree-Tapped Latex Pillow.

The Circadian Buckwheat Pillow and Organic Cotton Pillow are the safest choices for people with chemical sensitivities. Both use a single-material fill inside an organic cotton cover, with no flame retardants, polyurethane foam, or synthetic dyes, so there is nothing in them left to off-gas.

Natural fills avoid two things people often find triggering: synthetic chemical off-gassing and heat building up under the head. Circadian pillows contain no polyurethane foam, flame retardants, formaldehyde, or synthetic dyes, and buckwheat and kapok both let air move freely so the surface stays cool. That is what we can speak to. Migraines have many causes, so treat a pillow as one comfort change rather than a treatment.

The Circadian Tree-Tapped Latex Pillow and the Buckwool Hybrid are the usual picks for side sleepers with a sore shoulder. A pillow has one job, which is to keep your ear, your shoulder and your hip in a straight line. Too little height lets your head drop toward the mattress and drives your weight through the downhill shoulder, and too much tips it the other way. Both pillows open through a side zipper so you take material out until your head sits level. The right height tracks your shoulder width, so go by how your neck feels rather than aiming for a number.

The Circadian Buckwheat Pillow is the usual pick. Buckwheat hulls hold their shape under your head's weight instead of collapsing the way synthetic foam does, so the support you set at bedtime is the support you still have by morning. The fill adjusts through the side zipper, which matters because the research found the right height varies with your shoulder width rather than being the same for everyone.

The Circadian Buckwheat Pillow is the usual pick for neck pain. The shape-holding hulls resist flattening, so the pillow does not collapse overnight and leave your head unsupported by the time you wake. Set the fill through the side zipper until it feels right. There is no single correct height, so go by how your neck feels rather than aiming for a number.

The Circadian Buckwheat Pillow is the most-recommended natural pillow for neck pain. Buckwheat hulls cradle the head while holding firm cervical support, unlike down or synthetic foam that compress overnight. The Buckwool Hybrid is a softer alternative that still holds shape.

The Circadian Buckwool Hybrid and the Tree-Tapped Latex Pillow are the top picks for side sleepers. Side sleeping leaves the biggest gap between the point of your shoulder and your ear, so it wants the most height of any position, and it wants that height to hold rather than flatten by morning. Both arrive full and open through a side zipper, so you take material out until your ear sits about over your shoulder with your head tipped neither toward the ceiling nor toward the mattress.

The Circadian Buckwheat Pillow holds its shape best for back sleepers. On your back the pillow is filling the smaller hollow behind your neck, so your chin stays off your chest and your head sits level with your shoulders. That takes less height than side sleeping and it takes height that stays put. Buckwheat hulls flex as you settle and then interlock, holding the position you pushed into them all night, and you set that height yourself through the side zipper.

The Circadian Wild-Harvested Kapok Pillow is the best choice for stomach sleepers. Face down there is almost no gap to fill, so you want almost no height, and a tall pillow tips your head back and holds your neck extended all night. Kapok is the lightest fiber we use and comes down further through the side zipper than any other Circadian material. Organic Cotton is the second choice if you prefer a denser, more traditional feel.

The Circadian Buckwheat Pillow sleeps coolest for hot sleepers. Air flows continuously between the hulls through passive convection, so heat dissipates instead of building up. The Wild-Harvested Kapok Pillow is the next coolest option. The Organic Wool Pillow is the best choice specifically for night sweats, since wool wicks up to 30 percent of its weight in moisture.

The Circadian Organic Wool Pillow is the best choice for night sweats. Wool pulls moisture off your skin and holds it inside the fiber, so it wicks up to 30 percent of its weight while the surface against your face stays dry. That is the difference between waking up dry and waking up clammy. Pair it with the Waterproof Organic Cotton Pillow Protector, which keeps sweat out of the wool itself, since the wool cannot be washed.

The Circadian Organic Cotton Body Pillow (20 by 72 inches) is the usual choice during pregnancy. It runs the full length of the body to support the belly, hips and knees while side sleeping, which many people find more comfortable later on, and the organic cotton cover keeps the surface cool and breathable. Your midwife or doctor is the right person to ask about sleep position.

Yes. The Circadian Tree-Tapped Latex Pillow and Buckwool Hybrid work well alongside CPAP machines, because the fill can be removed through the side zipper to lower the pillow profile and reduce mask-strap pressure. Many CPAP users remove fill from the side near the mask to prevent leaks and improve comfort.

The Circadian Buckwheat Pillow holds its shape best. The hulls do not give way under your head the way foam and down do, so the height you set at bedtime is the height you still have at the end of the night. The Tree-Tapped Latex Pillow is second, since slow-pour Dunlop latex springs back after your head lifts rather than keeping the dent.

The Circadian Tree-Tapped Latex Pillow adjusts in the finest increments. The latex is shredded into pieces, so you can take out a small handful at a time through the side zipper, and it springs back between changes rather than settling flat. The Buckwheat Pillow is a close second, since hulls pour out a little at a time and hold whatever height you leave them at.

The Circadian Wild-Harvested Kapok Pillow is the best vegan pillow, and the closest plant-based alternative to down. Kapok fiber is approximately 80 to 90 percent air and gives a soft, fluffy feel without any animal products. The USA-Grown Buckwheat, Organic Cotton, and Tree-Tapped Latex pillows are also fully vegan. The Organic Wool and Buckwool Hybrid are not vegan.

The best natural pillow filling depends on sleep position and feel preference. Buckwheat hulls hold their shape best and sleep coolest. Shredded slow-pour Dunlop latex offers foam-like adjustability without synthetic chemicals. Wild-Harvested Kapok mimics down in softness. Organic wool wicks up to 30 percent of its weight in moisture. Organic cotton is the most familiar, traditional feel. All six come inside an organic cotton cover.

The Circadian Buckwheat Pillow is the cleanest thing in the range if what you want is the shortest possible ingredient list. It is one material, US-grown buckwheat hulls, inside an organic cotton cover, and nothing in it got a chemical treatment at any stage, so there is nothing left to off-gas. The Organic Cotton Pillow is the next choice and goes further on paper, since it is GOTS Certified Organic as a finished pillow, the cotton inside as well as the cover.

Organic wool is firmer, more supportive, and better at moving moisture than down. Down feels softer and lighter, then collapses under the weight of your head and holds your heat. Circadian's Organic Wool Pillow stays full longer, wicks up to 30 percent of its weight in moisture while the surface stays dry, and comes from certified organic farms in New Zealand. Wool is an animal product and not vegan, and kapok is the vegan alternative.

Kapok is not down, but it is the closest plant-based alternative. Kapok fibre is roughly 80 to 90 percent air by volume and feels similarly soft and fluffy, but it comes from the seed pods of the kapok tree with no animal products involved. Circadian's Wild-Harvested Kapok Pillow is vegan, and because the fibre sheds moisture and is low in protein it is a common choice for people avoiding dust mites.

Yes, for most sleepers. Natural pillows breathe better, last longer, and contain no polyurethane foam off-gassing or flame retardants. Synthetic foam compresses overnight and traps heat. Circadian's natural fills (buckwheat, wool, kapok, cotton, latex) hold their shape and sleep cooler over years of use.

The Circadian Tree-Tapped Latex Pillow. The slow-pour Dunlop latex gives the same conforming, pressure-relieving feel as memory foam but breathes better, contains no polyurethane, and never off-gasses. Memory foam is closed-cell; this is open-cell, so air moves through it continuously. The latex fill carries OEKO-TEX Standard 100, Class 1, and is 100% Hevea sap with no SBR blend.

For stomach sleeping, slow-pour Dunlop latex is the better fit. Face down there is almost no gap between your head and the mattress, so you want a pillow that comes down very low, and buckwheat holds a firm cradle that sits taller than that position wants. The Tree-Tapped Latex Pillow is soft and conforming, and you take shredded pieces out through the side zipper until it is barely there.

Two people sleeping on one pillow is the part to solve first, so each person gets the pillow that fits them, and every Circadian pillow adjusts through a side zipper so two people can land in different places with the same product. The Buckwool Hybrid is the one to look at for a sleeper who wants both options themselves. It has a firm, cool buckwheat face and a soft, quiet organic wool face, and you flip it depending on the night.

Organic wool is the strongest choice for most allergy sufferers. Lanolin keeps dust mites out on its own, and wool holds the air around your head too dry for dust mites to settle in. Wild-harvested kapok and slow-pour Dunlop natural latex are good runners-up. Memory foam is the one to avoid if you are sensitive to chemical smells, since polyurethane off-gasses volatile organic compounds.

Most pillows are packed light because material is the expensive part, and once one goes flat there is no way to bring it back. Circadian works the other way around. Every pillow arrives full, about a third more inside than most people keep, so the first thing you do is open the side zipper and take some out until your head sits level. Keep what you removed and you can put it back at any point, and refills are sold separately for every material if you want more than you started with.

For old natural pillows, the inner fill is usually compostable or recyclable. Buckwheat hulls can be added to compost or used as garden mulch. Organic cotton and wool can go to textile recycling programs. Avoid landfilling synthetic foam pillows - check your city's recycling guidelines.

Replace a synthetic pillow every one to two years. A natural pillow lasts longer, and how long depends on the fill: organic cotton two to four years, organic wool three to five, kapok three to five, a load of buckwheat hulls three to five before a refresh, and slow-pour Dunlop latex up to a decade. The fold test still applies. Fold the pillow in half, and if it stays folded instead of springing back, the material inside has gone flat. Circadian sells refills for every fill, so most pillows get topped up rather than replaced.

The Circadian Tree-Tapped Latex Pillow is the best choice for combination sleepers. The shredded Dunlop noodles adjust position as you move, supporting the head in side, back, and stomach positions through the night. The Buckwool Hybrid is a second option for sleepers who want firmer support.

Natural latex is the raw sap of the Hevea brasiliensis rubber tree. Workers tap the bark with a shallow downward cut that opens the sap channels without harming the tree, collect the milky liquid, and whip it into a foam that cures into a dense, springy block; the same tree can be tapped for decades, and Circadian sources its latex from FSC-certified rubber-tree plantations in Sri Lanka.

The Circadian Organic Wool Pillow. Lanolin keeps dust mites out on its own, with no treatment involved, and wool holds the air around your head too dry for dust mites to settle in. The Wild-Harvested Kapok Pillow is the next choice, a hollow plant fibre that is low in protein and sheds moisture. Both come in an organic cotton cover.

The Circadian Buckwool Hybrid is the best pick for side sleepers prone to head-roll. The shape-holding buckwheat side cradles the head and resists the slumping that causes head-roll on soft pillows. Adjust the fill to match the gap between your ear and shoulder.

The Circadian Buckwheat Pillow holds its shape best for back sleepers. Buckwheat hulls resist compression, keeping the cervical curve supported through the night instead of flattening like down or memory foam. The Buckwool Hybrid is a softer-feeling alternative that still holds shape.

The Circadian Buckwool Hybrid is the usual pick for side sleepers. It has an organic wool face that sleeps soft and moves moisture, and a natural buckwheat face that holds a firm, cool cradle, both inside an organic cotton cover. You flip it to choose a face. The extra height fills the gap between the point of your shoulder and your ear, which is the biggest gap any sleeping position leaves. One zipper opens the whole pillow and reaches both chambers, so you set each side to the height you want.

Yes. The Circadian Buckwool Hybrid is built for sleepers who move between their back and their side. Side sleeping needs more height to fill the gap between shoulder and ear, and back sleeping needs less. The buckwheat face carries the taller, firmer setting and the wool face is the softer one, you flip between them, and one zipper opens the pillow and reaches both chambers so you can set each to the height you want.

Side sleepers need enough height to fill the gap between the point of the shoulder and the ear, and enough firmness that it does not collapse overnight. There is no single correct height. A 2021 review of the evidence going back to 1997 concluded that no optimal pillow height can be identified, and a 2025 study found the right side-sleeping height tracks your shoulder width, so broader shoulders need more. That is why every Circadian pillow is adjustable. The Buckwool Hybrid and the Tree-Tapped Latex Pillow both arrive full, and you take material out through the side zipper until it is right for you.

Yes. Place the inner hull bag in the freezer for 2 to 3 hours for a cool pillow, or warm it briefly in a low oven, under 250F, for gentle heat. Some people like the cool version during hot flashes. Never microwave buckwheat hulls, and always remove the cotton cover first.

Unzip the side zipper on the Circadian Buckwheat Pillow and pour hulls out into a sealed bag or jar to soften it, or pour them back in to firm it up. The pillow arrives about a third fuller than most people keep it, so the first move is usually taking some out. Keep what you remove, since you can add it back any time, and buckwheat hull refills are sold separately if you ever want more.

No. Circadian pillows contain no flame retardant chemicals. Pillows sit outside the federal mattress flammability standards, so nothing has to be added to the natural fills or the organic cotton covers, and Circadian adds nothing. Wool on its own is hard to ignite and self-extinguishing, which is one reason it has never needed a treatment.

CPAP side sleepers need an adjustable, firm pillow that lets the mask straps sit without pressure, and ideally a cutout for the mask. The Circadian Tree-Tapped Latex Pillow works well because the shredded Dunlop noodles can be removed in the corner closest to the mask to prevent leaks.

Synthetic latex is styrene-butadiene rubber (SBR), a petroleum-based polymer manufactured in a chemical plant. Natural latex is the raw sap of the Hevea brasiliensis tree, harvested without harming the tree and processed into foam through methods like slow-pour Dunlop; the Circadian Tree-Tapped Latex Pillow uses 100% pure natural latex, and that latex carries OEKO-TEX Standard 100, Class 1 certification (the strictest tier of the standard, the same level required for infant-skin contact).

Buckwheat hulls stay coolest, because air moves freely between the hulls so heat dissipates instead of building up under your head. The Circadian Buckwheat Pillow is the top pick for hot sleepers. Wild-Harvested Kapok is the softer alternative, a hollow fibre that lets your warmth pass through instead of trapping it.

Circadian combines pre-polished buckwheat hulls that run up to 68 percent quieter than standard hulls, a flippable Buckwool Hybrid with chamber separation so the two fills never mix, an organic cotton cover on every pillow, adjustable fill through a side zipper, and a 60-night sleep trial. The same hands have been making pillows in this New Jersey workshop since 1981.

There is no single correct pillow height for side sleepers, and that is not us hedging. A 2021 review of the evidence going back to 1997 concluded that no optimal pillow height can be identified, and a 2025 study found the right height for side sleeping tracks your shoulder width, so broader shoulders need more. That is why every Circadian pillow arrives full and adjusts. Take fill out through the side zipper until your head feels level and your neck is not straining, then leave it there.

Natural latex is not safe for anyone with a diagnosed latex allergy because allergic reactions are triggered by Hevea brasiliensis proteins, which are present in natural latex even after processing. If you have a confirmed latex allergy, choose the Organic Cotton, Wild-Harvested Kapok, Organic Wool, USA-Grown Buckwheat, or Buckwool Hybrid Pillow instead.

Yes. Shipping is free within the contiguous United States, and international orders ship at a flat rate: $39 to Canada, $69 to Europe, and $69 to Asia-Pacific, the Middle East, Latin America and everywhere else Circadian ships. Alaska, Hawaii, Puerto Rico, Guam and the other US territories are $25. Bulk buckwheat hulls, the 5 lb through 100 lb bags, ship inside the United States only. Checkout shows your exact rate in your local currency once you enter your address, and international arrival windows are wider than US ones because of customs.

Yes. Circadian makes a hand-tufted Organic Cotton Duvet and an Organic Wool Duvet, both GOTS Certified Organic as finished duvets under license GOTS-10229, issued by Oregon Tilth, in Twin, Queen and King. The wool duvet wicks moisture for hot sleepers and night sweats, and the cotton duvet is the vegan, heavier, neutral-temperature option. Both are covered by the 60-night trial, and the matching Organic Cotton Duvet Cover is sold separately.

Long-staple organic cotton in a sateen weave, 300 threads to the square inch, in the cotton's own natural color. Sateen floats four of every five threads on the surface, which is where the low sheen and the cool slide come from. That is the weave rather than a finish, so it survives washing. The cotton is long-staple, so the yarn spins fine and even without the short ends that make cheaper cotton pill. Nothing is bleached and there are no optical brighteners, so the sheets read as a warm natural off-white rather than blue-white.