Benefits - Environmental protection and energy savings: prevents hot outdoor air from entering the room, helping reduce cooling power use and lower your bills. - Tool-free, easy setup: no drilling or tools required. Open the zip, place the hose, tighten, and attach the seal in the window frame for an airtight fit. - Reliable, durable material: made of waterproof polyester to provide dependable protection from harsh weather conditions. - Year-round use: maintain your preferred indoor climate without removing the seal in cooler weather; simply open or close the window, and reinstall next summer is easy. Material and construction - Durable waterproof polyester for long-lasting protection around portable air conditioner hoses. Setup and compatibility - No drilling or tools needed. Unzip, insert the hose, tighten, and secure the seal in the window frame to achieve an airtight seal around the portable AC. Use scenarios - Summer cooling in a bedroom or home office: keeps hot outdoor air out and improves cooling efficiency. - Rentals or short-term stays: quick, tool-free installation without permanent fixtures. - Seasonal climates: easy year-round use by just opening or closing the window; reinstallation next season is straightforward.