EZ MOUNT: Kitty Sill mounts to interior glass patio doors and windows and offers multiple levels that offer your cat a comfortable, fun and sunny spot with a bird's eye view STRONG & STURDY: Industrial-strength EZ Mount suction cups hold up to 50 lbs. and installs in seconds on glass windows or doors; remember to clean your window and suction cups monthly to ensure a tight seal (see window cleaning image) DURABLE: Reinforced high-grade sturdy steel frame for long-lasting durability cat perch for cats that love sunbathing FUNCTIONAL CAT WINDOW PERCH: Folds up to window so blinds and drapery can function normally (if kitty lets you) MACHINE WASHABLE: Shelf covers are removable and machine washable on this cat window hammock MEASURE YOUR WINDOW: Fits window glass space of 24"W x 19"H or larger; each cat window sill level has a super soft fleece sleeping area that is 23" x 12" BRAND YOU TRUST: Designed & patented by K&H with OVER 20 years of experience in creating safe, innovative, quality products for pets