Improve cooling and save energy: The window seal is made of durable waterproof material that blocks hot outdoor air and drafts from entering. It helps your room cool down faster, increases air conditioner efficiency and reduces energy use, lowering electricity costs. Waterproof and weatherproof: Designed to withstand rain, keeping your space cooler and drier on hot or wet days. Keep cold air in and warm air out: Installed between the window frame and the air conditioner hose, it directs warm exhaust outside and traps cool air inside for longer lasting comfort. Easy to install, no tools required: Insert the seal inside the window frame, route the air conditioner hose through the opening, close and secure with the zipper. You can open or close the window without removing the seal. Durable material and simple care: Made from sturdy waterproof fabric with easy wipe cleaning. Compatibility and fit: Suitable for most standard casement and sliding windows and portable AC hoses. Adjustable and easy to trim if needed. Practical use scenarios: Hot apartment or dorm room: faster cooling and lower energy bills. Rainy season: blocks wind and water intrusion while the AC runs. Temporary setups (rentals or shortterm stays): quick, reversible installation without damaging windows.