The Trieye eyewear glasses with integrated adjustable mirror will give you a completely different experience when rowing - A Game Changer.  You can see in the mirror if you are rowing in the right direction without turning your head around, and maybe be sure that the boat coming from behind sees you?!  The frame is made from TR90, a thermoplastic material that is incredibly durable, flexible, and lightweight. Frames made with TR90 are comfortable to wear because they bend under pressure and contour your face comfortably. Rubber tip for max comfort. Durable, lightweight and scratch-resistant Polycarbonate lenses with TriEye Mirror House so you can watch you're back. Enhance your visual experience with Trieye Polarized lenses, designed to eliminate glare, enhance clarity, and amplify contrast. Plus, they provide comprehensive protection against harmful UVA and UVB rays, ensuring your eyes are safeguarded from the sun's glare.