Utilizing the same heat-reflecting technology found in Mylar space blankets, the ASPEN Pet® self-warming rectangular lounger is lined with a layer of material that generates warmth by reflecting your pet's own body heat radiates back the warmth to the source. Covered with soft, faux lambswool plush and wide wale corduroy fabrics for added comfort and warmth. Each bed comes with a non-skid bottom that provides stability to keep it from slipping around.