4 Base Lens Curve – Lens 'Base Curve' is a measure of the front curvature of the lens. The higher the number, the greater the curve. 4 and 6 base lenses are generally flatter across the front. 8 base lenses have a greater curve for a more 'wrapped' look

Scratch-Resistant Mineral Glass Lenses – OTIS mineral glass lenses are naturally scratch resistant, optically correct and more sustainable than the plastic alternatives that go in most other eyewear. This makes them easily the best sunglass lenses on the planet

ECO Acetate Frame – Derived from cotton seeds and plant matter, the acetate component of this frame is 100% recyclable and 100% biodegradable. These frames are fully compliant to ISO1870 and have undergone exhaustive tests at specialized laboratories and declared 100% biodegradable. OTIS Eco-Acetate holds all the aesthetical characteristics of traditional acetate but feels warm and silky

Vissottica Hinges with Stainless Steel Screws – OTIS frames are produced with high quality 3, 5 and 7 barrel hinges. These premium grade Vissottica brand hinges are extremely durable and boast 100% corrosion resistance

100% UVA / UVB Protection – All OTIS fixed-tint lenses block 100% of harmful UVA, UVB and HEV light to provide superior protection from solar damage causing intraocular melanoma and macular degeneration, as well as reducing eye fatigue and reducing the visible signs of aging, while maintaining true color and depth perception