ProSeal™ Garage Door Bottom Seals are made of durable weather resistant PVC. The high quality vinyl remains flexible at extreme low temperatures, providing a tight seal for your garage door. ProSeal™ locks out the elements by conforming to the shape of your garage floor. Helps save energy, by keeping your garage warmer during the winter and cooler during the summer. Also, works great with our Tsunami Seal® Garage Door Threshold Seal.