The Speedcraft SL model is designed with a shorter lens profile and more compact nose bridge to fit smaller faces. With the exception of the lens air scoops, the SL model maintains the same high performance features and lens technology. High-impact resistant and lightweight polycarbonate lenses 5-base cylindrical shield lens for increased peripheral view and protection 360 degree visibility for unobstructed views and optimal field of vision Interchangeable scratch-resistant lenses provide 100% UV protection HYDROILO lens treatment repels water, dirt and oil Temple arm scoops to manage moisture Shatterproof and lightweight Grilamid TR90 frame Ultra-grip rubber nose pads and tips for a secure fit no matter how much you sweat Filter Category 3 Light Transmission 15%