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Here's what other sites are saying:
Let's break down how great these socks really are. "PhD" means they're smart, not smart like you and me, but smart because they fit better than any other sock, "outdoor" means "outside", where these socks perform at their best. "Light" means they have just a little cushioning, on these socks its on the bottom and the back of the foot. "Micro" means they're short, really short. PRODUCT FEATURES: New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management Flat knit durable toe seam for high burst strength 1x1 ribbed welt Achilles pad 1.75 overall height 71% Merino Wool, 27% Nylon, 2% Elastane
- Appalachian Outdoors refers to the men's version
The SmartWool PhD Outdoor Light Micro Sock satisfies your desire to have a sock at equal height to your shoe cuff, and it utilizes a little more wool than its ultralight counterparts to add a bit of extra warmth and cushion.
- Backcountry.com refers to the men's version
Material: Knit in USA of 71% Merino Wool, 27% Nylon, 2% Elastane New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in placePatent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortableStrategically placed mesh ventilation zones provide ventilation for temperature and moisture managementFlat knit durable toe seam for high burst strength1x1 ribbed weltAchilles pad1.75 overall height Product Care: Machine Wash Cold Gentle CycleDo Not BleachTumble Dry LowDo Not IronDo Not Dry Clean
- River Sports Outfitters refers to the men's version
The thickness scale for the PhD Outdoor socks goes Ultra Light, Light, Medium, Heavy these are the Smartwool PhD Outdoor Light Micro Socks and they offer just a little bit of cushion. Merino wool, nylon and elastane lets them regulate temperature, wick away moisture and last for miles with a foot-hugging fit. The 4 Degree Fit System keeps them in place whether you're hiking, trail running or biking and strategic mesh zones help feet stay dry and blister-free for miles.
- Altrec Outdoors refers to the men's version