In practice, cycling sunglasses can create a couple of issues for runners: Sweat on a runner's forehead isn't as easily transferred away since the evaporative effect of wind isn't as strong as when on a bike, and the head movement of running can cause the frame to slip down the nose. These sunglasses seem to alleviate these issues for runners, and it's due to a few factors: exceptional ventilation, the relative weightlessness of the frames and lens, which weigh 26 grams (0.80 ounces), and the super sticky nose bridge.
Even with the large shield-style lens size, there is enough ventilation to maintain airflow to your face. When you add the photochromic excellence and the build quality for the cost, Rudy Project has created a pair of sunglasses that give runners the cool look of an oversized frame and an edge in any light condition.
The Rudy Project Spinshield Air uses a pair of design elements that are essential to making them great-fitting sunglasses. First is the very effective non-slip compression fit of the frame, which uses secure wraparound geometry that isn't too tight. The ear and nose ergo-grip rubber pieces maintain very good adhesion even when wet with sweat.
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