Ryders Eyewear Sprint Sunglasses. * Grilamid TR-90 Duraflex frames: durable, flexible, Lightweight nylon base polymer * Front venting holes to prevent fogging * Pinned hinges are low profile and high strength. * Hydrophilic Rubber parts on critical nose or temple areas become tackier as you sweat for a more secure fit. * Medium to Large Fit Ryders Lens Information: Ryders Full-Focus Lenses are shaped thicker through the middle where the eye normally looks through and thinner towards the outer edge. This allows the eye to focus forward resulting in no eye strain or fatigue.