The K&H Pet Products EZ Mount Kitty Sill Deluxe with Bolster are the easiest strongest most versatile window sleeper on the market. The K&H EZ Window Mount Kitty Sills provide your cat/cats a front-row view of nature weather people and more without taking up valuable floor space. Cats love to bask in the warm sun and thrive on having a high vantage point and this one includes a removable bolster for added comfort. As a bonus this will assist in keeping messy hair off of your furniture! The patented design enables you to quickly fold up your kitty sill WITHOUT removing it from the window allowing full functionality of your curtains or blinds. Designed & patented by K&H with OVER 20 years of experience in creating innovative quality products; one year limited warranty. PATENTED - U.S. Patent # 9 924 697