The Scruffs Thermal, Self Heating Pet Beds are an ideal choice to keep your pet warm on those cold winter nights. Each bed contains a foam layer, backed with reflective foil. This layer is sandwiched between quilted polyester fibres and the beds main fill, it reflects body heat back to your pet, keeping them warm. The quilted polyester lies beneath a super soft fleece cover this layer holds warm air around your pet providing added insulation.