The patented K&H EZ Mount Window Kitty Sills are the easiest, strongest, most versatile window sleeper on the market. We’ve incorporated 2 push ’n’ turn suction cups and each level features 2 giant push cups for the ultimate in strength. These things suck! Really! Each suction cup holds in excess of 50 lbs. yet is still easily removable for cleaning. Exclusive design allows for window blinds, curtains and shades to operate normally! Covers easily remove for washing. One-year limited warranty. Special features exclusive to the K&H Brand Doesn’t interfere with blind and curtain use The K&H EZ Mount Window itty Sills are like no other on the market. The patent pending design enables you to quickly fold up your kitty sill WITHOUT removing it from the window, allowing full functionality of your curtains or blinds. This feature is included on all styles; Single Level, Double Stack, Triple Stack, and Quad Stack. Why settle for a Kitty Sill that restricts your blinds or curtains when you don’t have to? Washable cover removes without removing kitty sill The K&H EZ Mount Window Kitty Sills also offer a removable cover that can be removed WITHOUT having to remove the Kitty Sill from the window. That’s right; easily remove the cover for washing without having to uninstall the kitty sill. Just remove the cover, pop the cover in the washer, then reassemble the clean cover on the frame all without having to remove the kitty sill from the window. It can’t get much easier than that. No ugly PVC pipe The frame is not made of that unappealing PVC pipe, that stuff belongs under a sink in your bathroom! No one wants a drain pipe visible in their living space, right? The K&H EZ Mount Window Kitty Sill frames are constructed of fine steel for ultimate strength and style. The sleek frame creates a streamlined look like no other window mount kitty sill on the market. Why settle for less when you can have the best!