Because we're not selling you a mattress. We're selling you the layer the Japanese figured out 400 years ago — the part that actually touches your body. The slab underneath isn't the problem. The layer is. HanareCore™ replaces the layer, not the bed. That's why it's $149 instead of $2,000 — and why it works on whatever mattress you already own.

Most "bamboo cooling" toppers on Amazon are made by manufacturers who won't disclose what's actually in them. Most are synthetic blends with a thin bamboo facing. Hanare is built around a viscose-from-bamboo cover sitting over a high-density pillowtop core, with the architecture published openly. We tell you what's inside because the inside is what sets us apart.

That's actually when it works hardest. The conforming base of HanareCore™ wraps any mattress 8–20" deep — old, firm, sagging, even uneven — and changes the surface your body contacts. The worse the mattress underneath, the more obvious the difference is on night one.

Most American doctors are trained in medication, not sleep surfaces. Sleep medicine specialists are the ones catching on first — Dr. Naomi Watanabe, who recommends the Hanare, is one of them. The Lancet published the medium-firm research in 2003. The Japanese have known it for 400 years. American medicine is catching up.

Most customers feel a change on the first night. The full benefit — pressure-point relief, cooler sleep, the "hotel bed" feel — typically lands by night 7. We give you 100 nights to feel it. If you don't, every cent comes back.

Send it back. We pay return shipping. Full refund. No restocking fee. No "did you wash it?" interrogation. No questions. Less than 2% of orders are returned, but we built the trial that way because we'd rather refund a few than have anyone stuck with the wrong topper.

The conforming deep-pocket base fits any mattress 8 to 20 inches deep — including pillow-tops and adjustable bases. Setup takes under 30 seconds. No straps, no slipping.

The viscose-from-bamboo cover is gentler against sensitive skin than synthetic fibers. No latex, no formaldehyde, no synthetic chemical cooling treatments. Machine washable on cold.

Cover: 40% bamboo viscose (rayon from bamboo) · 60% polyester

Fill: High-density polyester · medium-firm pillowtop construction

Base: 100% polyester deep-pocket skirt · fits mattresses 8–20" deep

Sizes: Twin · Full · Queen · King · California King

Queen dimensions: 60" × 80" × 21"

Certification: OEKO-TEX® Standard 100 (BJ025 166847 TESTEX)

Origin: Designed in the US · Made in China · Shipped from US

Care: Cold machine wash separately · Line dry in shade · Do not bleach · Do not tumble dry