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Smartwool PhD Outdoor Ultra Light Micro

Now featuring an improved wool/nylon balance for improved durability in high-impact areas.  The articulated heel and 4-Degree Elite Fit System provide an unparalleled fit that keeps the sock in place so you don't have to fuss.  Ultra Light weight for maximum breathability, with a low-profile cut.

Sizing:

Smartwool Size Shoe Size
(Men)
Shoe Size
(Women)
Small 3-5.5 4-6.5
Medium 6-8.5 7-9.5
Large 9-11.5 10-12.5
XLarge 12-14.5 13+