Ryders Eyewear's Caliber Photochromic glasses feature TR90 frames that flex for optimal comfort. The lenses adjust the tint to suit ever-changing light levels thanks to photochromic technology. They're shatterproof and scratch-resistant, too. More importantly, they're optically correct, which means you get a clear, true view in any direction. Throw in UV protection and you've got a do-everything pair of glasses of the highest caliber.