Product concept is great, however the quality isn't there, i still feel air coming through it. The best remedy for leaky windows is to replace them. Cost is too expensive for such a frame with clear plastic layer. I can't justify paying $ 150 for one window insert while the cost to replace a whole window is between $ 300 to $ 400. Its a waste if money. I can't justify the cost for such a product. Had it been lower cost, would have made more sense to buy it. My advice, don't waste your money.