K&H Kitty Sill - Double Stack EZ Window Mount??? Double the fun of a window perch, the Kitty Sill - Double Stack EZ Window Mount??? is the perfect play/sleep area. Incorporating steel frames and K&H's unique push 'n turn super-strong suction cups, this window-mounted gem is sure to please. As with the single unit, it can be folded up against the glass in seconds to allow for normal operation of blinds, curtains, or shades. Covers easily remove for washing. Features: Perfect window-mounted play/sleep area Can be folded up against the glass in seconds to allow for normal operation of blinds, curtains, or shades Second level hole allows for movement between levels Removable cover removes for easy machine washing Item Specifications: Dimensions: 12L x 23W KH9092 655199090921