Adjustable size: two lengths, about 300 cm and about 400 cm. Trim to fit and it works with all sliding windows (horizontal or vertical) and is compatible with portable air conditioners or air dryers. Prevent cooling air from escaping: made from TU fabric with insulation and a heatinsulating bleaching process. Blocks cold air loss while reflecting sunlight and heat outside, helping the room cool faster and saving energy. Complete sealing: provides a tight, gap fit thanks to durable material and an expanded adhesive backing. Minimizes cold air leakage and helps keep insects out. Enhanced detail: precise cutting and routing areas allow easy adjustment without distortion. Texture treatment near the outlet keeps the tape from peeling when the air hose is inserted, eliminating gaps. Use scenarios: Seal a portable AC vent in a living room with a sliding window to keep cool air inside. Use in a workshop or garage to reduce warm air ingress while operating a portable dryer or AC. Install on a sunlit balcony door to lower heat gain and improve cooling efficiency.