ForceField UV SunBlock is based on the latest technology advances in UV chemistry. The product is specifically designed to protect natural, synthetic and blended fibers from the harmful effects of the sun. Surfaces that have been treated with ForceField UV SunBlock will stay looking newer longer. This sunblock does not wash off in water, so it is excellent for use in indoor and outdoor applications. Use it on draperies, tapestries, area rugs, upholstered furniture, patio furniture and whatever natural or synthetic fiber items are exposed to the sun’s damaging rays.