Sports glasses with photochromic polycarbonate lenses and open frameless design. Polycarbonate photochromic lenses. These lenses have a light transmission of 85-17%. The brighter the light, the darker the lens automatically becomes. One lens provides you with category 1, 2 and 3 levels of eye protection. The frameless design gives an open and lightweight feel. Full round lens shape gives optimal protection against sunlight, dust and wind. Block system prevents the temple tips damage the lenses while folded inwards. High-end Grilamid frame with adjustable rubber nose piece. - BSG-53PH