Because we're not selling you a mattress. We're selling you the layer the Japanese worked out 400 years ago, the one that actually touches your body. The block underneath isn't the problem: the layer is. KumoraCore™ replaces the layer, not the bed. That's why it costs €128.00 instead of €1,250, and that's why it works on the mattress you already have.

Most “cooling bamboo” toppers sold online come out of factories that refuse to say what's inside. They're synthetic blends with a thin bamboo veneer. Kumora is built around a bamboo viscose cover over a high-density pillow-top core, and the construction is published openly. We tell you what's inside because what's inside is what makes the difference.

That's exactly where it works hardest. The KumoraCore™ wraparound base hugs any mattress 20 to 50 cm thick, old, too firm, sagging, even uneven, and changes the surface your body touches. The more worn-out the mattress underneath, the more striking the difference from the very first night.

Most doctors are trained in medication, not in sleep surfaces. Sleep specialists were the first to understand it: Dr Naomi Watanabe, who recommends Kumora, is one of them. The Lancet published the research on medium-firm support in 2003. The Japanese have known it for 400 years; Western medicine is only now catching up.

Most customers feel a change from the very first night. The full effect, relief from pressure points, cooler sleep, that hotel-bed feeling, usually kicks in around the seventh night. You have 30 days to put it to the test, with a money-back guarantee.