Adjustable sizes: available in approx 3 m and approx 4 m to fit most sliding windows (horizontal or vertical) and compatible with all portable air conditioners or dryers. Prevent cold air loss: made from TU insulation fabric with a heatinsulating treatment. Blocks cold air from escaping, reflects heat away, helps the room cool faster, and reduces energy use. Tight, insectproof seal: sturdy adhesive backing and a reinforced edge deliver a leak fit that stops drafts and keeps insects out. Precise, durable fit: precisely cut and routed areas allow easy adjustment without distortion; textured edge near the outlet keeps the exhaust hose secure and minimizes gaps. Easy to install and use: wrap around the exhaust hose and window frame for a quick, reliable seal with most portable cooling setups. Use cases: Living room or bedroom with a portable AC in a sliding window for efficient cooling and lower energy bills. Office or studio space where a compact blower runs through a sliding window to maintain comfort. RV or camper with a sliding window setup, providing a tight seal that prevents heat and insects from entering.