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 the pet’s own body heat. This bed is covered with faux lambs wool plush and wide wale corduroy fabrics for added comfort and warmth. Each bed comes with a non-skid bottom providing a safe and hassle-free snuggly warm bed. This is not an electric bed- no plug or electricity needed!