Base Curve: 6 Polycarbonate: Polycarbonate is lightweight, comfortable, impact resistant, and provides UV protection. Expanded thermo-plastic rubber (TPR) nose pad (anti-allergenic) for additional protection. V-shaped groove (1.6 mm high towards the inside) for lens safety in the event of impact. 3D-Adjustable strap for comfortable wear over or under helmet. Adult Unisex.