The Optic Nerve Halogyn is an aggressive rimless style that offers unobstructed visibility and exceptional performance. The frame is made from TR90 resin for superior durability. The adjustable beryllium copper bridge rest is nested into a TPX rubber cover for custom adjustability and durable non-slip performance. The glass weighs in at a scant 17 grams. The polycarbonate lenses are vented and de-centered for fog-free action and meet Class 1 optical standards. The Optic Nerve Halogyn package comes with four sets of lenses and a hard-shell case.