From the manufacturer
Duck Brand Shrink Film Window Insulation Kit – Indoor
During the cold weather months, windows become a prime spot for energy loss. Indoor Duck Brand Shrink Film Window Kits create an added barrier between the outdoor air and the inside of your home, helping block drafts and air leaks that lead to high heating costs. Apply to the inside of your window to seal out the cold from getting into your home. Plus, it’s made with clear shrink film for good visibility and it’s easy to install and remove once the warmer weather arrives. Use together with other Duck Brand weatherization products to make your home more comfortable and energy efficient all year long.