The Closed Circuit glasses feature a slimmer silhouette frame that ensures fast electricity flow, providing full coverage performance with an ergonomic fit for various face shapes, low profile temples for headset compatibility, and long-haul ergonomics; key features include one-piece front construction, lightweight design, proper weight balance, forged stainless steel frame material, proprietary patented GUNNAR lens material and tint that blocks harmful blue light and 100% UV light, anti-reflective lens coatings on both sides, a silicone hard-coated lens to prevent scratching, compatibility for Asian and youth fits, and a prescription range of -4 to +4, with specs of lens width 56 mm, lens height 29 mm, nose 18 mm, frame width 130 mm, temple length 130 mm, and a weight of 16 grams (without packaging); included with purchase are a glasses case, microfiber pouch, microfiber cleaning cloth, and a 12-month warranty.