PHD Running Ult Light Crew

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Retailers' Descriptions

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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.


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. SmartWool PhD Run Ultra Light 3/4 crew socks offer a non-cushioned, precise fit that works well with minimalist footwear; socks rise 3.75 in. height. Merino wool provides excellent temperature control and moisture management, so you're warm when it's cold and cool when it's warm. ReliaWool puts more wool in high wear/high impact areas to increase durability and comfort. 4 Degree Elite Fit System improves comfort; 2 elastics provide greater stretch and recovery to keep the socks in place. Merino wool keeps your feet dry and inhospitable to bacteria that can cause odor. Strategically placed mesh zones provide ventilation for temperature and moisture management. SmartWool socks are guaranteed not to itch and can be repeatedly washed and dried without shrinking. Virtually seamless toes offer durability and minimize chafing and irritation. Closeout.


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