With 8.9cm diameter high quality suction cup, sturdy PVC frame and thick steel wire, this window mounted hammock has higher load capacity up to 15kg. > It can be installed on windows, tiled walls, smooth doors, etc., no punch or tools required. Clean the window and the suction cups before installing this cat perch, wait it dry then put them on the window. Made of breathable Oxford cloth and plastic, body temperature of the cat will not overheat in summer. In winter, you can add a mattress on this cat window bed and it will be the most comfortable. Easy to clean. Just remove the cover, hand wash or machine wash. If you don't feel easy to stick to the window, it may be due to the 4 transparent polypropylene suction cups deformed during transport, or at low cold winter temperature. Soak the suction cups in warm water for 2 minutes and clean with a damp cloth before installation