Beds and crate cushions with Thermatec™ Self Warming Technology are the perfect combination of beautiful design and revolutionary technology proven to keep your pets warmer than other conventional beds. Pets constantly lose heat. This is especially true when they lay down to rest or sleep. Thermatec™ uses SiverCore™ Technology, a space aged liner that captures that heat and safely reflects it back. SiverCore™ Technology also insulates against cold outside drafts and allows enough air flow to prevent overheating.