The S20R is affordable, lightweight, and good-looking. Shimano included the same quality lens with this model as their high-end models at a fraction of the cost. The frame is built from a lightweight, strong, and durable Grillamid TR90 material so you don't have to worry about crushing them. The lenses are strong, rigid, and lightweight and offer a full UV400 protection to comfortably shield your eyes even when the sun shines brightest. Anti-fog and anti-scratch treatment round out the package.