Spun with bamboo yarn, infused with green tea and active charcoal this mattress encompasses everything needed to promote a healthy nights sleep.* The green tea infused into the memory foam upper layer provides a long lasting freshness and repels bed bugs.* The Activ Charcoal (tm) repels odours and effectively manages moisture.*Bamboo yarn contains antibial properties and again repels dustmites and bedbugs.Beneath the 4cm 55D memory foam layer is a 1cm layer of 38D HD foam making for a smooth but slightly firmer layer above the 17.8cm icoil pocket springs. Together they work in unison aiding for a fantastic, healthy nights sleep with great value.