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Featuring Light Elite cushioning, these socks are a runners dream! Smartwool knows how to craft some serious socks and the PhD Run Light Elite Low is no exception. Targeted cushioning where runners need it most - on the ball and heel of the foot. They also feature the 4 Degree Elite Fit System which consists of two elastics for greater stretch and recovery to ensure your socks stay in place and specific mesh ventilation zones for additional breathability and moisture management. This low cut sock is also made of 50% Merino wool so it's naturally anti-microbial and moisture wicking. [+]