Excellent on keeping out full sun light and prevent 100% UV ray, it completely blacks out the classroom to effectively ensure the safety and security of everyone. Great option for Classroom and front doors, patio door, front porch, pergola, cabana, covered patio and living room/Bedroom.The insulated classroom door window cover can be easily attached with Velcro to tie up. Easy installation without any tool, no curtain rod necessary.Come in a wide range of solid color, sizes to suit every kind of home and every type of decor preference.