This thicken window insulation shrink film is made of thickened PE material, which is 75% thicker than ordinary window insulation, more durable, better insulation, tear-resistant, wind-resistant, tough, shrinkable, stretchable, non-deformable, waterproof, and keeps out the wind and cold in winter, also keep the house cool in summer, which is suitable for all window types, Aluminum window frame, wrought iron grills, sliding window, casement window, louvre bathroom/toilet window and even grilled gates and balcony.