Polyester NO MORE HOT AIR INCOMES – HOOMEE window seal keeps the warm air coming from the hose of your portable air conditioner away by locking the hose between the window frame and the window itself. Our window seal leaves out unwanted guests, rain and crates a “closed environment” that keeps your room cool for longer. INCREASE COOLING PERFORMANCE – Enjoy a cooler environment in summer thanks to HOOMEE! HOOMEE seals around your open window and then zips around the nozzle of your hose and blocks the return flow of warm air, so that your mobile air conditioning unit can be more efficient and cools your room in less time. REDUCE ENERGY CONSUMPTION - HOOMEE loves the Earth! This window seal contributes to reduce energy consumption and to lower carbon dioxide emissions, which is particularly high in summer due to the massive use of air conditioning. Preventing warm air circulating in your room, HOOMEE window seal helps you save money on electrical bills. EASY TO INSTALL – NO NEED FOR DRILLING HOLES . You don’t have to buy window kits, adapters for your hose or additional tools. All you need comes with your HOOMEE Window Seal! Simply apply the adhesive hook tape to the inside of your window frame and to the window itself. Attach the window seal to the hook tape. Then, open the zip on the window seal and place your air conditioner hose out of the window. At the end, close the zip tightly around the hose. Simple as it is. UNIVERSAL - Suitable for all portable air conditioners and tumble dryers regardless of manufacturer. Whether for windows that open to the left or windows that open to the right, bottom hung windows or skylights, HOOMEE Window Seal will do the job. Fits window with a maximum perimeter of 400 CM(157")