Shwood - Belmont Wood, The Original Wood Sunglasses, Walnut, Brown Polarized Lenses Made in US Wood frame Polarized Bridge: 22 millimeters Arm: 135 millimeters VERSATILE FIT: The Belmont looks best on Square, Oval, Rectangle, and Heart face shapes. MADE WITH QUALITY AND CARE: 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. 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: Featuring a birch core construction, spring hinges, and premium hardwoods. EXPERIMENT WITH NATURE: Cultivate creative thinking with our teams ongoing project dedicated to sharing interesting and inspiring content pertaining to all aspects of daily life. We document the experimental endeavors of our Shwood craftspeople, along with others who share a similar ethos.