Durable and robust materials - Made of 210T water-repellent fabric that resists pressure and stretching, maintaining shape and performance over time. The sturdy material provides a long service life and a reliable seal for portable mobile air conditioners. Waterproof and dustproof seal - Blocks rain, dust, and debris from entering the room. Helps keep the space cooler for longer and protects the air conditioner's internal components from dust and moisture, extending the unit’s life and improving efficiency. Adjustable size for universal fit - Sealing length can be adjusted to match the window size, offering universality and flexibility. Simple, user friendly design enables quick installation without professional skills. Improved cooling performance in summer - Prevents backflow of warm air, allowing the air conditioner to operate at maximum efficiency. This enhances cooling performance and speeds up room cooling. Compatible with different window types and sizes. Use scenarios - Home use with portable air conditioner on sliding or hung windows to achieve a tighter seal and better cooling. - Rental properties, dorms, or offices where quick, tool-free installation is important and window sizes vary. - Workshops or garages where weatherproof sealing helps keep the space cooler and protects the AC from dust and moisture.