The Thermo Pet Cave by K&H Pet Products is available in both a heated and unheated version. It’s a cat cave, it's a cat tunnel, it's both! This unique cat bed has a backdoor that can be left unzipped for cats that prefer cat tunnels. The Pet Cat Cave is designed to offer a cozy place for cats to hide and sleep. The interior is completely covered in soft fleece and also includes a hanging plush cat toy that can be used for playing and batting around. The outside of this premium cat bed is covered in soft luxurious polyester. The entire cat bed is machine washable (heated version: remove 4 watt MET listed heater first). Safety is our priority at K&H; we don't just use safety listed parts, we certify the entire product to ensure your safety - The heated version of this cat bed has been tested & certified by MET Labs and exceeds USA/CA electrical safety standards. One year limited warranty.