Kaymed Sunset Memory 400 Mattress in a Box - 5ft King Size; The Sunset Memory 400 mattress from Kaymed is perfect for those who prefer to sleep on a firm and supportive non-sprung sleeping surface. The memory foam Kaymed the worlds leading foam specialists use is unique to them and manufactured to their own innovative specifications. The high-tech 40mm memory foam layer is temperature sensitive and designed to soften when it comes into contact with warm surfaces. It moulds itself to the sleepers body shape and as a result reduces the pressure points on your body, resulting in less tossing and turning. Below the memory foam top layer is a deep 160mm layer of reflex foam block that creates a solid foundation and offers additional support. Covered in a luxurious removable soft stretch knit fabric cover you feel you are being welcomed to lie down. Kaymed are so confident in their product they include a 10-year warranty for good measure.