SUSTAINABILITY MEETS STYLE. The Francis' rounded silhouette and keyhole bridge are flattering on a wide range of face shapes. Unique to our Fifty Fifty Collection, this unisex style is a great choice for those seeking a classic but contemporary look. The Francis Fifty/Fifty looks best on Square, Oval, Rectangle, Diamond, and Heart face shapes. Unrivaled Clarity: "Optics by Carl Zeiss Vision" CR-39 or polarized lenses are fitted to all Shwood models. Lens features include 100% UVA/UVB protection and superior coatings for a perfect blend of comfort and protection. Made From Nature: Cellulose acetate is a natural and renewable material derived from cotton and wood pulp. Lightweight and extremely strong, this environmentally friendly material boasts a unique warmth that can only be found in nature.