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Call the doctor.

When training for a marathon, you need a doctor waiting on you hand and foot. With the PhD Ultra Light Mini Running Sock, you have a mini doctor right in your shoe. With a four-degree fit system, this doctor keeps you much more comfortable than the latex-glove-wearing kinds. The PhD features moisture-, temperature-, and odor-controlling fabric as well as strategic mesh vents for maximum ventilation. High-density impact zones absorb shock and reduce abrasion so you can run longer without pesky blisters.

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SmartWool PhD Running Ultra Light Mini Sock

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Here's what others have to say...

5 5

Great supportive socks

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I love these socks and the overall support they give my feet. The overall longevity of these socks are amazing and they keep wanting me to come back for more!

5 5

A great running sock

  • Familiarity: I've put it through the wringer
  • Fit: True to size

This is the only running sock I own after trying out lots of different manufacturers. I have about 20 pair of them and just cycle through them for running and everyday use. The wear really well, keep out the stank and wick really well. I would not have thought that I would like the wool, but you could never tell that's what they have in them. They maintain their stretchiness and shape really well. Eventually, if you use them enough (and I mean alot), you'll see wear marks in the toe box and the heel, but they still perform as expected.

5 5

Smartwool has it right!

I first bought these on sale and didn't expect much for the price. Well, these socks are incredible. The fit is exact and even though I don't really like wool, these socks take punishment and shed odors extremely well. I still have my original pairs from 3 years ago and I wear these everyday! Even to work! I tried other brands and expected the same performance, fit, & comfort. Wasted my money on them. I now have 20 pairs of SW PhD Ultra lights if that tells you how much I believe in them.
PS - the Ultra light is the only way to go. The light is too thick.

5 5


I definitely tend to get a bit scientific with my shoe to sock interface and the SmartWool PhD Running Ultra Light Mini Socks definitely do the job when it comes to a running application. The wool/nylon/elastic blend gives a fit that is not too bulky, yet not too thin which can lead to some great temperature control.

The abrasion reducer also works really well as I rock New Balance MT10s which run great, but give a good amount of rub in the heel. I also dig the color, which is scary because I never care about that part.

5 5

my favorite trail running socks

These socks were perfect out of the box! The PhD design creates a fit that works wonderfully with the active movement that occurs while running. I love how breathable the ultra light thickness is and yet how comfortable they are still. The mini length is my favorite for trail running because the top of the sock band fits snug against my skin well above my ankles, which prevents small rocks and other small things from getting in between my socks and skin. The wool fiber qualities make for a super quick drying sock also. They are very comfortable and I tend to want to wear them all day long after I run in them. I have never once gotten a blister since I started wearing SmartWool's PhD socks. Doing all this while still managing to look amazingly cool. SmartWool is king!

P.S. the Ultra Light Micro sock is also a beast too and I prefer those for the roads or anytime I won't have to worry about small rocks getting into my socks.

5 5

the perfect thickness, with just the right amount of cushioning

These and the SmartWool Outdoor Ultra Light Mini Socks are my all-time favorites. I use them for hiking, backpacking, the gym, and just hanging out. They are the perfect thickness, with just the right amount of cushioning. You won't overheat, and you won't slide around in them. Just get 'em, you won't regret it...

5 5

Best Sock Ever!!!!

Smartwool rocks and this sock is the best. I love it for everything from cruizing around town to running a 1/2 marathon. Nothing but smartwool goes on my feet

5 5

Perfect Sock

I refuse to wear anything but these socks. I wear these running constantly. They don't stretch out from sweat and I can run through creeks knowing that my feet won't stay wet for long.

I'll never wear anything else!