PHD Running Ult Light Crew

Where to Buy

Retailers' Descriptions

Here's what other sites are saying:

Think you can't run in wool socks? Think again. The Run Ultra Light 3/4 crew socks feature lightweight, breathable merino wool and a secure fit for total comfort during warm or cool weather runs.


You spent an obscene amount of money on those fancy running shoes, so why would you run in a pair of cheapo socks that eliminate any good that the shoes are doing for your feet. The Smartwool PhD Running Ultra Light 3/4 Crew Sock has an advanced degree in comfort and support to work with your high-dollar running shoes and provide increased performance with reduced fatigue.


Lightweight SmartWool running crew features a non-cushioned construction for a streamlined fit on shorter runs. Different style ribbing at welt and leg foster a slim fit. Constructed with 52% merino wool, 44% nylon, and 4% elastane. Overall 6 height.

- The North Face

From a winter run on frost-hardened trails to a summer interval session on the track, the Smartwool PhD Running Ultra Light 3/4 Crew Socks are versatile enough to keep your feet happy year-round. Made from soft merino wool, these running socks regulate temperature and moisture, and they have strategic mesh panels for ventilation and elastic bands for a snug, secure fit.

- Altrec Outdoors