The Aspen Pet Self-Warming Bed utilizes the same heat-reflecting technology found in Mylar “space blankets”. Lined with a layer of material that generates warmth by reflecting the pets own body heat. Covered with faux lambs wool plush and wide wale corduroy fabric for added comfort and warmth. Each bed comes with a non-skid bottom providing a safe and hassle-free warm bed. This is not an electric bed. No plug or electricity needed. Great for cats of all sizes and breeds.