Designed to protect your mattress and buffer sudden changes of temperature during the night, this mattress protector from Velfont is made with an innovative Outlast® pure cotton cover. Temperature Regulating The Outlast® material used in this protector was originally developed for NASA to balance temperature changes. It is designed to absorb, store and release heat that the body emits during the different stages of sleep. When there's an excess of heat, it will be absorbed and distributed all over the fabric, but when the body temperature cools, it will be released. This means that you experience a well-regulated climate throughout the night, without feeling too cold or too hot. Cotton is also soft and cosy to touch, and this protector fits mattresses up to 30cm deep.