Specifically engineered with PTFE, a chemical compound which reduces friction on the surface of the blade, the Duralast winter blade is designed to slide across your windshield with a smoother action, and with less force, for a cleaner wipe. Less friction also means less wear and tear on the blade for greater flexibility and longer blade life. Rubber-shrouded frame engineered to prevent ice build-up and maintain even pressure distribution Designed to make installation quick and easy Advanced rubber formulation to give a smoother, cleaner windshield wipe Low friction design provides greater flexibility and longer blade life