This adjustable air conditioner gasket seals sliding windows and fits most portable air conditioners or dryers, helping you stay cool more efficiently. Adjustable size: Two length options with an extendable design to fit a wide range of window gaps. Compatible with all sliding windows and most portable air conditioners or dryers. Improves cooling efficiency: Made with TU fabric insulation and a heatinsulating bleaching process. Blocks cold air from escaping while reflecting sun and heat outside, helping the room cool faster and reducing energy use. Complete sealing and protection: Tight, gap installation thanks to the material and expanded firm sticker. Prevents cold air leakage and keeps insects out, providing reliable protection. Precise fit and durability: Precise cutting and routing areas allow adjustment without distortion. Texture treatment near the outlet keeps the hose in place after installation. Use scenarios: In a hot living room or bedroom with a portable AC, to accelerate cooling. In slidingdoor offices or apartments to reduce drafts and keep bugs out while cooling or drying. In rental spaces where permanent window modifications are not allowed, for a quick, temporary seal.