The engineering and design of the Smith Frontier/Ignitor Mirror adult winter sports goggles provide full eye protection and improved visibility, rain or shine! Designed for medium fit, those alpine ski and snowboard goggles feature a double thermal lens with a ventilation system, an anti-fog treatment and a non-slip adjustable strap that will be sure to please ski enthusiasts this season! Also, those alpine ski and snowboard goggles feature a VLT (Visible Light Transfer) rating of 35%, promoting a clear and accurate vision in both sunny and variable weather.