Fenestrelle Adjustable Window Screens allow fresh air and gentle breezes in while keeping mosquitoes, bugs, and other insects out. Our window screens feature a white, powder-coated aluminum box frame and fiberglass screen that hold up to the harshest of conditions. They are designed to fit in double-hung windows. Weatherstripping on the top and bottom adjust to rough surfaces. Faster and cheaper than fitting permanent window screens, our window screens give you a durable and attractive choice that also works great with cats!