The Nike trainer s features max optics that provide precise clarity from all angles. These are for smaller heads; they are a small-fit frame. Lightweight, durable nylon frame. Sport-wrap, 8-base frame offers maximum coverage. Durable high tension hinges. Ventilated, self-adjusting nose bridge provides an individualized fit. Nike vision tints are scientifically tuned for specific environments. Using light transmission analysis, optimization of colors and light levels are dynamically filtered through each lens. This light architecture allows the creation of lenses with the perfect vision profile for Sport, and environment.