Cracks and gaps around windows and doors can cause drafts to come into your home leading to high heating and cooling costs. Large Gap Self-Adhesive Duck Brand Heavy-Duty Weatherstrip Seals are made with durable and flexible material allowing them to stand up against extreme temperatures that cause other seals to freeze or crack. They are a great solution for replacing old or worn door and window seals forming a barrier against the outdoor air as well as dust pollen and insects during the warmer months.