With a thermo-reflective layer that radiates your pet’s body heat back to him, this self-warming pet blanket provides constant, comforting warmth. Naturally warming without cords, electricity or worry, unique 4-layer construction includes plush, washable fleece on top, thermal insulation, heat reflecting layer and non-slip base. Safe and convenient for crate, cage or floor, this self-warming blanket is perfect for pets of all ages, and especially comforting for seniors. 55% polyester/35% aluminum/10% PVC. Large: 40" L x 30" W. Small: 26" L x 19" W.