Large Cushion Bolster Cover: Zoratoo windowsill perch is lined with a large cushion bolster that has a skin-friendly furry cover filled with premium cotton for snuggling comfort. Your cats will be obsessed with snuggling with their head on this large cushion bolster cuddle bed. It also can be easily removed by zipper for washing. No Suction Cups Dropping Risk: This cat bed utilizes the principle of physics balance. It avoids the risk of being easily dropped by the suction cups attached to the glass. Minimize the risk of accidental drops. The metal hooks are 2cm extended from the body of the cat bed that fits most kinds of window with slot. There is no worry that the window can t be closed with this cat bed on the window sill. Easy to Attach & Adjust: Zoratoo windowsill cat perch features a sliding clamping slot adjustment design. Simply adjust it by pressing the clamps and sliding until the supporting feet rest against the wall. It is so easy to assemble that no tools are needed. Stable Structure for Great Comfort & Safety: The support frame is connected by two hard metal straight pipes, making the whole perch extremely strong and solid, can holds up to 40lbs. The product dimension of the medium size is 21.7'x15' and the large size is 24.4'x15', suitable for cats of all size. Cats Private Space: While using on the window sill, cats can enjoy watching the birds and surroundings outside, and sunbathing as well. Hanging on the bedside, you will fall asleep and wake up with your cat, enjoying the time spent with each other in each private space.