Northwave Razer Photochromic Sunglasses. Fully Adjustable Cycling sunglasses with Photochromic lenses for adaptable sun protection. Razers feature a minimal frame for an unobstructed field of vision with extended polycarbonate lenses for coverage and protection. Each frame is supplied with 2 sets of lenses for performance in a wide range of lighting conditions. Buy this Northwave Razer Photochromic Sunglasses Was £109.99 Now £75.89.