•One-Way Window Film Privacy【UV PROTECTION & HEAT INSULATION】One-way window film blocks up to 90% of harmful UV rays, effectively preventing direct sunlight, slowing down skin aging, protecting furniture and collectibles from aging and fading, and also reducing up to 68% of glare, softening indoor light, and preventing sunlight from damaging your eyes. Its mirrored effect reflects heat and reduces the amount of heat transfer, helping to reduce expensive cooling costs in the hot summer.