Shimano S70R Photochromic Sunglasses. Shimano creates eyewear with the same precision and attention to detail as their superb components and the S70R Photochromic Sunglasses certainly exemplify high performance eyewear in every fashion. The S70R features Shimano's innovative Metal Fit Design technology which is a beta titanium plate that connects the two separate frames. Beta titanium delivers a high rigidity versus elasticity ratio which translates to more precise tension to create a perfect fit. Combined with the 3D Digital Fit Technology, adjustable nose piece and temples, plus an adjustable lens angle, and you've never had eyewear that fit so well. Two sets of lenses are included, including a Photochromic Grey, which automatically adjusts to handle the demands of changing conditions from bright sunshine to cloudy skies. The other lens option that's included is Clear for use in rainy conditions or darker conditions. Additionally, the frames are constructed of Grilamid TR90 nylon to ensure they're lightweight, strong, and durable.