The Shinobi Sport Performance Sunglasses are our aggressive premium model with a fixed lens attachment for high-speed activities. Poor visibility will no longer hinder you. The Shinobi features the same top-quality, 2.2 mm thick, machine-ground toric lenses as the Ronin and offers an extremely stable and easy-to-change lens attachment technology. Simply slide the two buttons on each arm back, press the center of the nose bridge together, swap the lens, and let it snap back into place immediately. The Shinobi provides an excellent fit for all our helmets, with the arms designed to avoid interference and maximize comfort. Included are a hard-shell case, a microfiber pouch, and three nose pieces to help you find the perfect fit.