Photochromic lenses are light-adaptive lenses.. The lenses darken automatically when exposed to sunlight, then fade back when you return indoors or when the light changes.. Utilizes the Epoch Hybrid frame, featuring foam around the lenses to keep wind and debris out and increase comfort when riding.. 100% UVA/UVB protection. Shatterproof polycarbonate, light-adaptive lenses. Includes interchangeable arms and adjustable elastic strap. Meets or exceeds ANSI Z87.1 standards.Shatterproof polycarbonate, light-adaptive lenses