Description Benefits of the Kitty Sill™ Sturdiest, most attractive, easy to assemble cat sill on the market. Adjustable to any windowsill using provided Velcro® fasteners. Screws are provided for more permanent attachment. Supports over 40 pounds. Super soft orthopedic foam. Washable faux lambskin. Size - 14" x 24" surface Recommended for year-round indoor use.