The SG B'Twin 500 glasses are light, with a category 1 lens for low light conditions and a category 3 lens for sun protection.
Sun protection
Polycarbonate, shock-resistant, 100% UV protection lenses. Categories 0-3
Ergonomic grip
Rubber tips and nose piece.
Horizontal field of vision
Good field of vision.
Anti-fogging
Rimless bottom edge.
Use restriction :Do not protect from infra-red rays.
Warranty
MaintenanceThese glasses must be transported in the case provided. The lenses must be cleaned regularly. Never dry clean; always use water at room temperature (about 20°C) with a mild detergent.
Storage intructionsKeep these glasses at a relative humidity of 90%, away from solvents or any other corrosive substance and between 5°C and 40°C in temperature.