It is made of flexible polyurethane foam. It increases the firmness of the mattress, protects it from getting wet, prolongs its life and at the same time ensures comfortable sleep regardless of the position adopted. The cover of the topper is made of durable, anti-allergic polyester knitted fabric quilted with air-conditioning non-woven fabric. The cover is washable at 60 °C and thanks to the possibility of opening into two parts, each half of the cover can be washed separately. The total height is about 5 cm.