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The SmartWool PhD Ultra Light 3/4 Socks utilize the latest in technology to ensure that you have comfortable, dry feet when you're trail running or just hanging around. For comfort and fit, these socks have been designed with the new 4 Degree Elite Fit System which uses two elastics to keep the socks up and in place. Using ReliaWool Technology you have longer lasting and great protection in the high impact areas. Strategically placed Mesh Ventilation Zones help remove moisture and sweat so your feet won't feel gross and cold while you're trying to enjoy the day running or hiking. No longer will you have to suffer with cold feet when you wear the SmartWool PhD Ultra Light 3/4 Socks. [+]