The Magpul Helix is designed to support your active lifestyle in all conditions by providing superior clarity, contrast, and impact protection whenever you need it. The Helix exceeds expectations in humid or wet environments where moisture and condensation cause normal lenses to fog or collect water. Its lens and frame design sheds sweat and moisture, keeping your field of view clear despite less than favorable conditions. The interchangeable lens system also allows the wearer to transition to lower light operations with a clear lens or facilitates easy replacement of the lenses when needed. Like the rest of Magpul's eyewear line, the lenses are ballistic rated for increased protection and the frames are constructed of TR90NZZ to ensure strength, flexibility, and impact protection.