Self-warming material radiates heat back to pet. Non-slip bottom for stability. Warmth with no electricity needed. Fill made from recycled plastic bottles. Removable bottom liner for easy wash and care. Warranty: One year Perfect for any time of the year. The pillow sleeping surface includes a layer of special insulation that radiates warmth generated from the pets own body heat. A cozy, self-warming lounge bed that every pet will love.