Made of hollow fibre that reacts with the heat released by our body, heats up and uses its heat capacity to heat the air remaining between the fibers, creating a layer of heat that isolates us from the cold. Maximum breathability to prevent sweating during sleep. HYPOALLERGENIC - Made from raw materials that prevent any kind of allergy. Antibacterial and anti-dust mite treatment. Designed to rest in a room with a temperature ranging from 15 to 23 degrees. Easy to wash at up to 40 °C. Drying should be carried out at a low temperature.