●Keeping the heat out of the rv with the double layer reflective side, blocks out the sun, keep heat out or cold out, helps to save on your electric bill. ●Full 2.8 inch of foam to help stop heat/light transfer. ●Fits 14"x 14" RV/camper standard skylights/vents. ●Waterproof outer layer, perfect for RV shower room, the exterior fabric cover has a zipper, can be removed for washing if needed. ●The latest upgrade: the four side faces are covered with non-slip particles, so that the RV vent insulator stays in the skylight and does not slip off.