The surface of the very soft heating pad is made of breathable and skin-friendly material. Thanks to automatic power-off, electronic sensor technology prevents the heater from overheating in the event of a fault (BSS Beurer safety system). The product has been granted the international Oeko-Tex standard 100 mark. It guarantees that the product is safe for the user, e.g. the pH level of the product is skin-friendly and the dyes used are non-toxic.