POC Know, Lightweight Sunglasses STAYS PUT: The hydrophilic rubber stays grippy even when wet, so the glasses will stick to your nose when you move, regardless of rain or transpiration OPTIMAL FIELD OF YOU: Features the superior optical performance of Carl Zeiss lenses, treated with Ripel, for clear vision and easy cleaning CLEAR AS DAY: Perfect for partly cloudy weather and has the VLT (Visible Light Transmission) of 22% FITS YOUR ACTIVITY: The grilamid frame is lightweight, flexible, and durable which makes Know perfect for almost any athletic endeavor FIND YOUR COLOR: The Know is available in four colors