Key features: Frame made of cellulose acetate. Square frame. Transparent linear reinforcement on the temple. 5-point metal hinge. Offers great resistance to handling. Lenses Include: Lenses certified ISO, IAF, and KAB MC 04. Frame delivered with two lens colors, easily interchangeable at your local optician or in any Jimmy Fairly store: Gradient brown lenses are category 3: protect against glare in sunny conditions. Yellow lenses are category 1: protect against glare in cloudy conditions or indoors. All our lenses provide 100% UVA and UVB protection.