Most carbon fiber eyewear glasses frames in the market were not made of pure carbon fiber.Now YMO eyewear provides military level carbon fiber with 100% pure carbon fiber front and 85% carbon fiber-15% glass-fiber temples nice and sounds!Carbon fiber is harder than stainless,glass fiber is softer and more flexible.From carbon fiber material,accessories to grade A sunlens uv400,every process and detail have been seriously taken care of.YMO EYEWEAR would provide you the most highend carbon fiber sunglasses ever.