CK20121S — Women’s Sunglasses. Calvin Klein’s CK20121S presents as metal aviators designed for everyday use and for occasions that call for a touch of sophistication. The silhouette strikes a balance between fashion and practicality, making it a solid option for outdoor activities where you want a statement piece. The Calvin Klein Collection finishes its frames with refined detailing and a premium feel. Measurements are 57-17-140: each lens is 57 mm wide, the bridge measures 17 mm, and the temples are 140 mm long. A 57 mm lens width typically flatters oval, square, and rectangular face shapes. Mount and shape: the aviator profile includes a double lower bar and a distinctive teardrop lens shape that nods to classic aviation heritage. Lenses: UV400 protection blocks 100% of UVA and UVB rays. With a category 2 sun filter rating, they are suitable for driving and for medium-light conditions.