The strength of Infinity Ultrex allows for narrower frames and bigger views. It stays true and square for years of dependable operation and performance. Ultrex is 8X stronger than vinyl. It’s 3.5X stronger than wood and vinyl composites like Fibrex. It won’t melt in the sun. Also, one square inch can support 34,000 pounds! With Ultrex, you enjoy ultimate performance, beautiful views, and protection from the elements.