Engineered for extreme strength and easy assembly, the K&H Kitty Sill is purrfect for any cat that enjoys basking in the sun. In fact, this ingeniously designed cat perch can hold up to 18kg! The ultra-comfortable orthopaedic foam and super soft fleece cover provide your cat with ultimate comfort while sunbathing in your window sill. On the heated Thermo-Kitty Sill, the removable heater provides that extra warmth your cat craves. Its internal thermostats warm to your cats body temperature when in use. No tools are needed for installation when using the hook & loop fasteners. Screws are also included for those who prefer a more permanent installation. Please see our Kitty Sill instruction manual for further details.