We believe that these ought to be included with every RV for purchase. It fits standard 14-inch RV vents and features a full 2 ¾-inches of foam to stop heat transfer. The reflective surface blocks the sun’s damaging rays, keeping your RV cooler in the summer and warmer in the winter, saving you energy and increasing A/C efficiency. The 3-layer protection, including a reflective layer, foam insulating layer, and synthetic fleece layer, provides excellent UV ray protection. Don’t miss out on this essential accessory that will provide you with year-round comfort.