TabbyNapper is a sturdy and comfortable cat window bed that cradles your cats and kittens in soft, fleecy comfort Heavy duty. Holds small cats, large cats, and multiple cats all at once! Up to 35lbs Securely fits double hung and casement windows! Your cat is safe and snug like a bug in a rug Prevents boredom and destructive behavior Easy to assemble and install. No tools needed, but can be installed permanently if desired.