The Mainstay lives where form and function collide. Amazingly light and extremely tough, this featherweight can hold its own. Features a Grilamid frame with a 5 barrel hinge. Features: - Frame: 6 base mold injected Grilamid frame with a 5 barrel hinge - Optics: 6 base Melanin infused Polycarbonate lens. 100% UV protection. Up to 98% Blue Light protection - Measurement: 49h - 142w - 135l - Weight: 28 grams - California Design. Hand Crafted In Italy