Camco RV Vent Insulator with Reflective Surface fits snugly in RV vent opening with a full 2.75" of foam to help stop heat transfer, keeping your RV cooler in summer and warmer in winter. Reflective surface blocks 100% of the sun's damaging rays. Fits standard 14" RV vents. Fits standard 14" RV vents Reflective surface blocks the sun's damaging rays Full 2.75" of foam to help stop heat transfer Durable and easy to store Keep your RV cooler in the Summer and warmer in the Winter