The Camco SunShield Reflective Window Cover has a surface that blocks 100 percent of the sun's damaging rays. It can be used for RVs, vans, boats or at home. This item features air-filled cells encapsulated in lightweight, flexible polypropylene between two layers of reflective film. The RV window cover can be attached with simple hook and loop fasteners for easy installation. It helps to protect the interior of a vehicle from UV rays and assists with temperature control. This item also is also easy to store when not in use.