What did the Japanese and Korean buckwheat pillow tradition get right?
In Japan, a pillow filled with buckwheat hulls is called a sobakawa pillow or soba gara makura, and the classic sizes are small. One Japanese maker lists about 13.7 by 19.6 inches (35 x 50 cm) with 3.3 lb (1.5 kg) of hulls, and about 16.9 by 24.8 inches (43 x 63 cm) with 5.5 lb (2.5 kg) (Futon Tokyo, Futon Tokyo). Korea has its own hull pillows, often rolls. This guide covers what both got right.
Short answer: The tradition got three things right. The pillow was sized to your head, not the bed. You set the height by taking hulls out, and you aired the pillow in the sun. A large Japanese pillow holds about 5.5 lb (2.5 kg) of hulls (Futon Tokyo). Leave unwashed fill behind. A Korean study found new buckwheat pillows carried 60,950 EU/g of endotoxin, against 4,887 EU/g on synthetic ones (J Korean Med Sci, 2004). If eating buckwheat has ever given you a reaction, choose another fill.
This guide is for: people in the US weighing a Japanese-style, Korean-style or US-made hull pillow, and anyone curious where the idea came from.
Key Takeaways
Three points carry the whole article: the size, the height rule, and the one safety question worth asking a seller before you buy.
- Size: A large traditional Japanese hull pillow is about 16.9 by 24.8 inches (43 x 63 cm) (Futon Tokyo). That is smaller than the 20 by 26 inch US standard, so it sits loose in an American case and suits people who lie still (Mattress Firm).
- Height: Research names no single right height. In a 2024 study, nine side sleepers tried pillows from 8 to 14 cm, and the best height depended on shoulder width. Buy a pillow with an opening so you can take hulls out (Med Biol Eng Comput, 2024).
- Cleaning: In one Korean study, new buckwheat pillows carried 60,950 EU/g of endotoxin. Synthetic pillows carried 4,887 EU/g. Ask whether the hulls were washed or only sifted (J Korean Med Sci, 2004).
On This Page
Each entry below matches a section heading, so you can jump straight to the question you came with and skip the rest if you like.
What is a sobakawa pillow, and where does the name come from?
A sobakawa pillow is a cloth case filled with buckwheat hulls. Soba means buckwheat in Japanese, and the name is simply the word for the hulls.
The Japanese word soba means buckwheat, the same soba as the noodles. Sobakawa is the Japanese word for buckwheat hulls, used in bedding for centuries (Japan Culture Hub). The hulls are the dry outer shells left over when the seed is milled. So the name just describes the fill. The longer Japanese name is soba gara makura. Makura means pillow.
Korean shares the idea. Buckwheat tea is called memil-cha in Korea and soba-cha in Japan (Wikipedia), and a US seller gives the Korean pillow's name as memil-baege (PineTales).
On a US listing, the word sobakawa tells you the fill, not where it came from. A pillow sewn and filled in the US can use the name. Some sellers claim a lot for it. J-Life International calls the soba gara makura the most popular pillow in modern Japan (J-Life). We found no survey behind that. A Japanese futon shop writes that the pillows are no longer seen in many futon stores, though it reports rising interest from younger customers (Futon no Tsutaya).
Our guide to how a Japanese buckwheat pillow differs from a US one covers how they are made. This page is about what the traditions can teach you when you choose one.
How old is the Japanese buckwheat pillow tradition?
Some sellers date it to the 1400s. Others tie it to the Edo period, when soba noodles spread and hulls became a cheap byproduct of milling.
Nobody has pinned down a firm date. Most of the history online comes from sellers. J-Life dates soba gara makura to the 15th century in Japan (J-Life). Futon Tokyo, a Japanese futon maker, gives a later and more specific account. It says people began reusing hulls, left over from grinding buckwheat into flour, once soba became popular in the Edo period (1603 to 1867) (Futon Tokyo).
The later account matches what we know about older Japanese pillows. Before hulls filled whole pillows, some were packed into a small cushion on top of a box. An antiques dealer describes the hakomakura as a paper-wrapped silk pillow on a lacquered box, used by people such as geisha to protect elaborate hair (Shibui). One account of these high pillows says the cushion on top held buckwheat hulls or chaff (Tokyo Jinja).
Most households came to it later. PineTales says cotton became much easier to get in the 19th century, and hull pillows then spread whatever a family's wealth (PineTales).
The fair summary is a few hundred years, and it started as thrift. The pillow grew out of using up a milling waste, not out of sleep science. Keep that in mind when a health claim leans on the word "traditional."
How is a Korean buckwheat pillow different from a Japanese one?
Korean hull pillows are more often narrow rolls or small blocks, and the ones sold in the US commonly mix cypress wood chips in with the hulls.
The hull inside is the same. The shapes and extras differ. PineTales notes that Korean hull pillows are often neck rolls or body-support shapes. The listings sold to US buyers match that. Kepitome lists its Korean neck pillow at 12 by 4 by 4 inches (Kepitome). A Begozani square pillow is sold as a small block rather than a full bed pillow (Cain Cosmetic).
The bigger difference is what goes in alongside the hulls. Begozani sells its pillows as cypress and buckwheat pillows, which means wood from the cypress tree goes into the case with the hulls (Cain Cosmetic). The square pillow also has an outer cover, a middle cover and an inner case.
| Feature | Japanese style | Korean style |
|---|---|---|
| Common shape | Flat rectangle | Roll or small block |
| Listed size | 13.7 x 19.6 in or 16.9 x 24.8 in | 12 x 4 in roll; small square block |
| Fill | Hulls only | Hulls, often with cypress chips |
| Hull origin on the pages we counted | Named on every Japanese-made page | Named on none |
| Covers | Case plus sleeve | Up to three layers |
The sizes come from the listings above and from Futon Tokyo. The origin row comes from our count further down.
What size is a traditional Japanese buckwheat pillow in inches?
Japanese sellers list two common sizes, about 14 by 20 inches and 17 by 25 inches, both smaller than the 20 by 26 inch US standard pillow.
A traditional Japanese hull pillow is smaller than the pillow most US beds come with. Futon Tokyo sells two sizes, about 35 x 50 cm and 43 x 63 cm (Futon Tokyo, Futon Tokyo). A US standard pillow is 20 by 26 inches, the size you are most likely to find in an American bedroom (Mattress Firm).
A smaller pillow is easier to lift and turn at night. US makers copy the size. Hullo says its 14 by 20 inch pillow is based on the traditional Japanese size (Hullo). J-Life lists a 13 by 18 inch rectangle at 3.8 pounds (J-Life). At under 4 pounds, you can reshape or flip it with one hand when you wake.
| Pillow | Inches | cm | Hulls | Source |
|---|---|---|---|---|
| Japanese small | 13.7 x 19.6 | 35 x 50 | 3.3 lb (1.5 kg) | Futon Tokyo |
| Japanese large | 16.9 x 24.8 | 43 x 63 | 5.5 lb (2.5 kg) | Futon Tokyo |
| US-made rectangle | 13 x 18 | not listed | 3.8 lb as listed | J-Life |
| US-made Japanese size | 14 x 20 | not listed | not on the page read | Hullo |
The small size suits people who sleep on their back and do not turn much. If you sleep on your side and have broad shoulders, the large Japanese size or a US standard gives you more room. Futon Tokyo advises envelope-style covers, because a zip case with a narrow opening is too tight for a pillow filled to the brim.
How high should a sobakawa pillow be?
High enough to keep your neck level, which differs by person. Research cannot name one height, so a pillow you can adjust is the safe choice.
The tradition let you set it yourself. Futon Tokyo's pillow has an opening for hulls, and the height changes with how many hulls are inside (Futon Tokyo). J-Life notes that most soba gara makura have zippers so you can take hulls out if the pillow is too firm (J-Life).
Research backs the idea that no single height suits everyone. A 2014 study of new pillow shapes concluded that pillows of one uniform height do not suit lying on your back or on your side (J Phys Ther Sci, 2014). In a 2024 study, nine healthy adults lay on their side on pillows of 8, 10, 12 and 14 cm. The best height for each person was worked out from their shoulder width (Med Biol Eng Comput, 2024, PubMed).
Hulls do this job well. They keep the shape you press into them. Start with the pillow full, lie down, and take out a cup of hulls at a time until your head sits level with your spine. Keep the hulls you remove in a dry, sealed bag in case you want them back. Our guide to pillow height by sleep position explains how to check.
How did Japanese households care for hull pillows?
They aired the pillow in the sun, kept it out of damp cupboards, and swapped all of the hulls once they had crushed, rather than topping them up.
Hull pillows cannot go in a washing machine. Sun and air did the job instead. J-Life advises putting the pillow out in the sun now and then so moisture does not build up in the hulls (J-Life).
Storage mattered just as much. A Japanese bedding shop warns that a hull pillow left in a closet for long periods gathers damp and can attract insects, which makes it a poor fit for a guest room (Ito Kiyoshi).
The habit US buyers skip most is replacing all of the fill. Hulls crack under the weight of a head over the years. Emma Sleep Japan says a pillow that feels lower is the sign. It warns that crushed hulls turn to powder that can cause allergy or rhinitis, and it advises replacing all the hulls rather than adding more (Emma Sleep Japan). A refill bag makes topping up tempting, but the crushed hulls and their powder stay in the case.
Makers also treat the hulls before sale. Futon Tokyo heats its Japanese-grown hulls in a kiln at about 212°F (100°C) and uses microwaves to kill insects and eggs. If you live somewhere humid, our page on hull pillows, moisture and mold covers storage.
Are traditional hull pillows safe if you have allergies or asthma?
For most people, yes. If you react to buckwheat food, skip these pillows. Everyone else should ask for hulls that were washed, not just sifted.
For most people, the hulls themselves are not the problem. An allergist quoted by HealthDay explains that an allergy needs a protein, so the hull alone is unlikely to cause one, but processing can leave flour residue behind (HealthDay). The risk comes in two parts.
The first is buckwheat allergy. Thermo Fisher's allergen reference puts it at an estimated 0.22% of Japanese school children, and lists sleeping on a hull-filled pillow as one route of exposure (Thermo Fisher). Korean pediatricians note that these pillows are common in Korea and Japan, but that studies of the link are rare (Clin Exp Pediatr, 2016).
The second is endotoxin, a residue from bacteria that may make asthma worse. A Korean study measured 60,950 EU/g on new buckwheat pillows against 4,887 EU/g on synthetic ones (J Korean Med Sci, 2004, DOI). The authors traced it to flour residue. Korean makers only removed fine dust, while US hulls are normally cleaned thoroughly (full text). Dust mite allergen levels were similar on both types after three months.
If eating buckwheat has ever made you react, choose another fill. If you have asthma, ask the seller whether the hulls were washed or only sifted.
What do sellers of Japanese and Korean pillows tell you about their hulls?
Of six seller pages we read, three named Japan as the hull source, one named the US, and two gave no growing origin, both Korean.
We read six seller pages on September 29, 2026, each describing a pillow sold as a Japanese or Korean buckwheat pillow. We counted one thing: whether the page names a country for the hulls themselves, separate from where the pillow was sewn. The count reflects only what each page states in writing. No pillow was bought or handled for it.
| What the page says about the hulls | Pages | Pages counted |
|---|---|---|
| Names Japan | 3 | Futon Tokyo, organic, Futon Tokyo, US stock, Futon Tokyo, gift set |
| Names the United States | 1 | J-Life International |
| Names no country | 2 | Kepitome, Cain Cosmetic |
Futon Tokyo states its hulls were harvested and processed in Japan, and J-Life says it uses organic American hulls. All three Japan pages come from one seller. Read that bucket as a single source.
Every Japanese-made pillow named its hull source, and neither of the Korean-style pages did. Both Korean pages mentioned cypress in the fill. The gap says nothing about quality. It tells you what to ask before you buy: where the hulls were grown, and whether they were washed or only sifted.
Which parts of the tradition should you keep in a US bedroom?
Keep the small size, the adjustable height and the sun-airing habit. Skip unwashed hulls, and skip the idea that one height suits everyone.
Every verdict in this table is ours. It draws on the sources above. No maker publishes it, and it ranks no product.
| Tradition | Keep, adapt or skip | Our reason |
|---|---|---|
| Small pillow sized to the head | Keep if you sleep on your back; go larger if you sleep on your side | Less weight to move; shoulders need width |
| Height set by removing hulls | Keep | Research backs no single height |
| Airing in the sun | Keep, and do it more in humid summers | Hulls hold damp |
| Replacing all hulls once crushed | Keep | Crushed hulls shed powder |
| Hulls sifted but not washed | Skip | 12 times the endotoxin in one study |
| Cypress chips in the fill | Your choice | We found no study of a sleep benefit |
| Box pillow with a small top cushion | Skip | Built to protect hair, not necks |
Look for three things in a listing: a way to take hulls out, a stated hull origin, and a word on cleaning. On the pages we read, the Japanese-made pillows gave you the first two. A US-made pillow in the Japanese size can cover all three if the seller says the hulls were washed. If you sleep on your side, check the width before you check the story.
Common questions
Six short answers to questions people ask about Japanese and Korean hull pillows that the sections above do not fully cover.
Is a sobakawa pillow the same as a buckwheat pillow?
Yes, they are the same thing. Sobakawa is the Japanese word for the hulls, so any pillow filled with buckwheat hulls fits the name. The word does not tell you where the hulls grew.
Will a Japanese pillow fit a US pillowcase?
It fits, but loosely. At 16.9 by 24.8 inches, a large Japanese pillow sits loose in a 20 by 26 inch case. Futon Tokyo recommends envelope-style covers over zip cases.
What else goes into a Korean buckwheat pillow?
Many mix in cypress wood chips. Begozani sells its pillows as cypress and buckwheat pillows, with the wood in the case alongside the hulls (Cain Cosmetic). We found no study showing that the chips help you sleep.
When do the hulls in a sobakawa pillow need replacing?
None of our sources gives a fixed number of years. When your pillow feels lower than it used to, the hulls have crushed. Replace the whole fill at that point.
Can you wash buckwheat hulls at home?
A Japanese furniture site says the hulls themselves cannot be washed (Heyagoto). Wash the case and dry the hulls in the sun.
Do people in Japan still use buckwheat pillows?
Yes, though fewer shops stock them now. One writer in Japan notes that many pillows now mix the hulls with memory foam (Hidden Japan).