- Enhanced cooling efficiency: efficient thermal insulation prevents cold air loss and blocks warm air entry, delivering a dependable sealed barrier for uninterrupted comfort. - Broad compatibility: fits inward and outward window styles, with double vent adaptability and perimeter support up to 300 cm after sizing confirmation. - Durable materials: waterproof fabric with a UV protection layer minimizes heat penetration, withstands environmental exposure, and keeps the interior dry for reliable performance. - Easy installation: no drilling required; quick removal and storage with a user friendly zipper and tape system; designed for a simple 3-step installation. Use scenarios - Summer living room: helps keep the room cooler with minimal energy use in hot weather. - Winter drafts: reduces heat loss and blocks cold drafts for a steadier indoor temperature. - Rental or multi-window homes: non-destructive, removable, and easily sized to fit different window types.