The Twister offers premium optical quality and is extremely lightweight at 26 grams. It features a new revolutionary design with a 9.0 base curve. The sleek features encourage all day wear and comfort. The unitary lens offers a wider field of vision than regular glasses. The wraparound design offers a secure fit and increased protection around the eyes, minimizing slippage. Lenses are scratch resistant, hard-coated and 100% polycarbonate, which filter out 99.9% of harmful UV rays. The blue mirror, outdoor lens with silver mirror finish and grey lens are popular shades for all outdoor work or recreation. CSA approved.