The window catio is made of 100% solid Finnish spruce wood. It has 16 braces for better stability. The waterproof roof and paint of the cat window perch ensures durability for all weather and year-round outdoor use. Large size: 43.3 in. x 25.2 in. x 47.2 in. Our cat window hammock have amply spaces for cats to rest, snooze, and play within a safe area.