The window kit is made of durable, water-repellent special fabric with a zipper and two sliders. Thanks to the Velcro tape, installation on all common windows and skylights with a circumference of up to 400 cm is easy and quick. It can also be installed at low room temperatures, preventing the ingress of exhaust air and moisture. It is easy to care for and machine washable up to 40°. The window can be easily opened and closed while installed.