While the sunglasses may seem a little simpler than many running sunglasses, that doesn't mean it lacks any tech specs., the glasses adapts to varying degrees of sunlight, providing full coverage on the road or trail. When I tested the red mirror lenses, I had clear depth perception and vision with almost no light leakage. The vented rubber nose bridge keeps the lenses from fogging up too much, and with the textured temples, the frame sits comfortably on my face.