Our Self-warming Crate Pad captures pets body heat and radiates back the warmth to the source. The four corners are slit to allow the pad to fit many different edges. The adjustable size makes this pad fit into many different crates. The topside of the crate pad is made from soft, inviting microfleece while the bottom has a ??stay-put?? non-slip fabric to keep the pad from bunching up the crate. Just throw the whole pad in the wash for easy cleaning and care.