Large gaps and cracks around windows and doors cause drafts that lead to high energy costs. Duck Brand Max Strength Expanding Foam Seals fill larger gaps up to 1 in. around windows and doors that may let outdoor air inside. They can also help keep out unwanted dust insects and pollen during the warmer months. Simply cut to size and then apply the self-adhesive foam to your door or window for added weather protection. This premium self-adhesive foam seal expands to fill larger cracks and gaps in your home to block drafts.