Designed for thrill seekers and adventure enthusiasts, the Portside is the ideal frame to coexist alongside your active lifestyle. Constructed of super lightweight swiss grilamid with non-slip nose and temples, this 8-base frame is ideal for all activities on land or out at sea. MINERAL GLASS Mineral Glass is created from natural elements like sand and soda ash. It’s endlessly recyclable and harmless to humans and animals alike. It’s high resistance to scratching and lack of distortion make it the world’s best lens material. It really does have to be Mineral Glass. 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 ageing, while maintaing true color and depth perception. 6 BASE LENS CURVE Lens 'Base Curve' is a measure of the front curvature of the lens. The higher the number, the greater the curve. TR90 GRILAMID FRAME Portside is made from injection moulded Swiss Grilamid. Swiss TR90 Grilamid is an extremely light, extremely tough, shape-retaining and highly durable polymer ideal for the manufacture of lightweight eyewear. Formulated as synthetic titanium, TR90 Grilamid's outstanding properties include excellent flexural fatigue strength, high resistance to chemicals and fracturing and excellent weathering and UV resistance. Swiss TR90 Grilamid is the highest quality and lightest engineering plastic in existence. 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.