Number one frame and lens system in the industry in a carbon fiber style finish Double density foam with a 3rd layer of hydro-repellent velvet 15mm extra-thick foam for outstanding warmth 3 large anti-slip beads on strap, of high quality silicone that doesn't crumble when you stretch it Light sensative dual lens Progrip patented "no fog" lens technology Pre-cut foam and molded channels for ear stems to allow for most eyeglasses