ESS EE9018-17: Accelerate your eye pro with the Rollbar interchangeable-lens sunglass from ESS. Fly through lens swaps and secure your safety with the auto-locking Rollbar lens gate. Revel in a sleek-yet rugged design that\'s built to excel in grueling environments. Count on military-grade polycarbonate to deliver crisp and accurate field of view, plus Ansi Z87+ and MIL Spec ballistic protection. Leave discomfort in the dust with a balanced fit and low-drag temple arms that won\'t interfere with hats, helmets, hearing pro, or comms gear. The Rollbar sunglass frame features a rotating lens gate that provides extremely rapid lens exchange and secure lens retention under impact.