These comfy sunglasses have spring loaded arms so they aren't too tight on your noggin, leaving you headache free all day long. They're polarised and UV400. The bamboo accents provide a lightweight frame that is comfy to wear and lighter on the environment. Every pair comes with a bamboo capsule case for protection. Our entire selection of sunnies is custom designed for FEVER on Straddie. Get em here, no where else.