Camco's Dome-Shaped RV Skylight Insulator helps deflect damaging sun rays from your RV's skylight. It fits standard 14-inch x 22-inch RV skylights with a 4-inch depth or more. Once installed, the insulator helps reduce heat transfer, increases A/C efficiency and saves energy. This product helps keep your RV cooler in the summer and warmer in the winter. The skylight insulator measures 14-inches x 22-inches x 4 ½-inches at the thickest point. Product includes: (1) foam skylight insulator with sewn cover, (2) adjustable straps and installation hardware. Easy to install.