High performance, lightweight, semi rimless and all style the goodr Astro G Sunglasses My Sweat Has An Octane Rating. Its wrap-around, semi rimless frame is light and works well with all head sizes. Fully adjustable silicone nose piece and silicone arm grips help prevent slippage during your run. Also, these bad boys come stocked with polarized lenses that provide optimal clarity in the face of bright sunlight.