The Fortis Wraps are designed to fit perfectly around your face, eliminating unwanted light and glare. The side lenses give you total 180 degree peripheral vision. The Switch version is the top-of-the range with photochromic lenses which change with the light conditions. Soft rubber inserts on the frame arms ensure they don't slip off your head and a unique vent system at the top of the frame, increases airflow preventing fogging. Fortis Eyewear are specialists in producing fishing sunglasses that help you see deeper into the water to locate your quarry, and help reduce eye strain at the same time.The polarised lens help eliminate glare and maintain a high visual clarity and are manufactured, and tested, to British Standard BS EN ISO 12312-1:2015.