The Helix provides the incredible performance of the Adaptalite Photocromic road lens in a single lens shield silhouette that provides a panoramic field of view. - Adaptalite lenses automatically adapt to varying UV levels changing from light to dark tint in less than 15 seconds. - Aerodynamically engineered frames and lenses have been designed for optimized air flow to prevent fogging while still ensuring full wind protection. - Full- time 100 percent UVA and UVB protection while still providing exceptional optical clarity. - Lenses made from a material called NXT which is a revolutionary unbreakable optical polymer that is 10-20 percent lighter than other sports lenses.