The Camco RV Vent Insulator with Reflective Surface protects against the sun's destructive UV rays. It is designed to fit 14" RV vents. This insulator minimizes heat transfer and improves A/C efficiency - helping keep your RV at a more comfortable temperature during every season. It features a full 2 3/4 in. of foam, keeping your RV cool in the summer and warm in the winter. Quality UV protection is achieved using three-layer material construction - a reflective sheet, foam insulation, and synthetic fleece. This camper must-have is great for motorhomes, travel trailers, 5th wheels, and more.