Cracks and gaps around windows and doors can cause drafts and air leaks that lead to high heating and cooling costs. Duck® Brand Max Strength Silicone Weatherstrip Seals are used to seal gaps around windows and doors that may let conditioned air escape and outdoor air in. They can also help keep out unwanted dust, insects and pollen during the warmer months. Use together with other Duck® Brand weatherization products to make your home more comfortable and energy efficient all year long.