The Ancol Self-Heating Pet Pad is an innovative creation that warms your pet and will quickly become you cat's or dog's favourite nap spot. The clever thermal structure inside the pad reflects your pet's heat back to them to keep them cosy and warm. The lamb fleece style cover is soft and comfortable, and can be removed and machine washed for a thorough and fuss-free clean. The Ancol Self-Heating Pet Pad is available in different sizes and can be used in a dog crate, on the floor, or on your pet's favourite chair to keep it free of fur. three sizes Small 48 x 38 cm Medium 64 x 49 cm Large 90 x 64cm -We are committed to reducing our packaging and using recycled and recyclable packaging. This item is supplied with packaging that is widely recycled. Cover=Polyester ( can be removed and machine washed on low temperature, gentle cycle) Inner= Aluminium Foil & Mineral Fibre Wadding The silvery foil faces up and is the reflective material, the soft fleece fabric is the thermal layer.