Sturdy cat window seat offers a soft comfortable feel for all sized cats to sunbath and view the outdoors K&H Kitty Sill cat window perch is strong sturdy enough to hold the heaviest of cats, supports up to 40 pounds (be sure to let the velcro cure) Super-soft orthopedic foam base with removable faux-lambskin washable cover No tools required and only a 2" windowsill is required for hook and loop or permanent installation. The legs are 3/4" wide and 9" from windowsill to bottom of legs