Official sources and product facts

Manufacturer and international retailer

OFUTON KOBO Co., Ltd. (株式会社 お布団工房) manufactures HIMARI 日葵 and SORA 宙 in Oyama, Tochigi, Japan. KAWAGUCHISEIKEN CO., LTD. is the authorized international retailer and operator of www.ofutonkobo.com and its official Shopify store, shop.ofutonkobo.com. These are separate companies with different roles.

Family heritage and company history

The Tochigi Prefecture 2025 company case study, page 9, records a business origin in 1873 and incorporation in 1949. The 1873 date describes the manufacturer's family-business heritage; it does not date the website operator, the present models, or uninterrupted production of these models.

Tochigi Prefecture ·2025 ·p.9 (PDF)

What the current models contain

Both models have cotton covers. HIMARI uses 25% wool / 75% TEIJIN polyester comfort filling and a separate approximately 8 cm firm polyester core. SORA uses 50% wool / 50% polyester comfort filling and a separate polyester support core. The filling percentages are not percentages of the whole mattress. Nominal loft and dimensions can vary; they are product specifications, not new independent measurements.

Choose by your needs

Compare HIMARI for balanced, medium-firm support with SORA for fuller cushioning. Measure your space: their lengths differ. Both need a firm, level surface and regular airing. Neither is a promise of pain treatment, guaranteed comfort, or a machine-washable whole mattress. Available widths depend on the destination.

International buying guide

What each source can establish

• Tochigi Prefecture company case study (2025), page 9: manufacturer identity, business history and bedding manufacture. This is not an independent comfort test, a government product endorsement, or proof of this retailer's authorization. Tochigi Prefecture ·p.9 (PDF)
• Manufacturer's Japanese introduction: its own workshop and company narrative. This is a first-party source, not an independent review. OFUTON KOBO ·日本語
• Current local product pages and Terms: offered sizes, published prices, care, dispatch, import charges and returns. The official store and checkout confirm current availability and commercial details.
• Customer Voices translates historical 2019 reviews from the manufacturer's own online store. It is not a set of recent verified international purchases of the current HIMARI and SORA models. Customer Voices ·English
• For J-QUALITY or other certification claims, check the issuer, holder, number, date and scope. A company or factory credential is not evidence of measured comfort or medical performance. The company's mention in the prefectural publication does not establish the current validity of an individual certificate.

Verify the destination before ordering

These 79 language entries cover published storefronts for 57 countries and regions. Language and currency are shown for each entry; English remains English where that is the offered language. Japan is the manufacturing country, not a listed delivery destination for this international store. Prices, stock, import charges and return conditions may change: use the linked local sources, not another country's quote.