TH 1857/RE/S sunglasses are part of the new designer Bio-Based capsule collection by Tommy Hilfiger. This range is sustainable, bio-based and biodegradable. All materials used are natural and from a biodegradable origin. The raw materials used in the M49 formulation are Cellulose Acetate derived from wood and a plasticizer ester base of citric acid derived mainly from starch of vegetable origin. Make renewable possible, whilst looking great at the same time! These have a rectangle / square frame shape, finished in a Grey colour with Grey lenses. 57mm lens width. Super stylish Acetate shades . All of our frames offer 100% UV protection and include a case and cleaning cloth.