BEX™ PERFORMANCE Polarized features lightweight, durable nylon polymer temples with impressive flexibility, durability and memory. Sunglass frame made with a tough and durable TR90 material Hinge: Reinforced nylon with stainless steel pin Bridge: Built into the frame Frame: One solid front frame with with inset lenses, and hinged temple tips Shape: A mid-size rounded rectangular lens with generous coverage against the elements. Complimentary to a variety of face shapes.