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, offering an extremely stable and easy-to-change lens attachment technology. Simply push the two buttons on each temple back, press the center of the nose bridge together, switch the lens, and let it snap back into place immediately. The Shinobi provides an excellent fit for all our helmets, with the temples designed to avoid interference and maximize comfort. Included are a hard case, a microfiber pouch, and three nose pieces to help you find the perfect fit.