Twain is a versatile smaller frame style designed for children ages 5 to 10 years old and teens needing smaller frames. Engineered to improve colour vision, EnChroma Twain glasses are available with our 100% UV absorbing outdoor and indoor lenses. These Italian-crafted classic frames are constructed with TR-90, a lightweight nylon-based material known for its comfort and shape retaining qualities. Case included. Available in Smooth Black or Night Sky (non-rubberized).