Risk-Free Shopping—Free 2-Day Shipping on Orders Over $50* Risk-Free Shopping—Free Returns on Orders Over $50* Risk-Free Shopping—Price Match Guarantee

Detail Images

  • SmartWool - PhD Outdoor Ultra Light Micro Sock - Women's -

Current Color

  • SmartWool - PhD Outdoor Ultra Light Micro Sock - Women's -

SmartWool PhD Outdoor Ultra Light Micro Sock - Women's

Temporarily Out Of Stock

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

Can't wait? Consider one of the other Lightweight Hiking Socks we have in stock.

View Similar Products

13 Reviews


It only takes one walk, workout, or hike in the SmartWool Women's PhD Outdoor Ultra Light Micro Sock to understand why cotton or other blended versions can't compete. The effective blend of nature's finest fiber and functional synthetics means you suffer less soggy foot and more happy trails, and super-low cut means your ankle has plenty of breathing room.

  • Blended composition maximizes the benefits of each separate material while minimizing fabric drawbacks
  • Soft merino wool breathes well, helps regulate body temperature, and is naturally odor resistant
  • Nylon components dry quickly, breathe well, and add extra durability
  • 4Degree Elite Fit system employs ankle, instep, and arch elastic bands for a snug fit, support, and circulation
  • ReliaWool tech on the bottom of the sock combines high-density impact zones along the ball and heel for long-lasting protection
  • Mesh zones allow heat and moisture to escape quickly to promote faster drying to reduce swamp foot
  • Virtually seamless toe construction limits irritation and chafing
  • Item #SWL0772

Tech Specs

54% merino wool, 44% nylon, 2% elastane
Recommended Use
hiking, running
Manufacturer Warranty
2 years

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

SmartWool= life

    Anyone who buys SmartWool socks know how amazing they are. Always comfortable, great at moisture wicking, and all around a super solid sock for hiking/backpacking/trail running. These socks are great for any of my summer adventure activities, and would definitely recommend them.

    They make me want to love socks

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

    I generally do not enjoy socks very much- they feel restrictive and make my feet uncomfortable. But these are SO much different! They are super comfortable for all day use, and they wick moisture very well. Plus they don't stink. I wear them with casual boots, or with hiking/running shoes and I love them all the same. Hands down would recommend these, I could wear them every day!

    Great socks!

    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: True to size

    If you're considering a wool sock, you probably already understand the benefits. This is what you'd expect from a quality merino blend. Nice and thin to wick moisture and dry quickly. Great for running, hiking, or everyday wear.

    Rockin' pink socks!

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

    These are my all time favorite socks. I use them for running, cycling, hiking and every day use. They are cool, comfy and kept my toes from getting blisters through 25 mile a day hikes across the Camino de Santiago.

    Sizing off for me

    • Familiarity: I've put it through the wringer
    • Fit: Runs large

    I typically wear size 5.5/6.0 US shoes and I got the size SM in these micro socks. The size SM is just a tiny too big for my feet. If I don't slip my foot in my shoe correctly then I can feel the extra material which can be annoying. Besides the fit, I love these socks. Smartwool quailty, very durable socks and they will last you. This are super breathable and don't hold odor, I was suprised at how fast these socks dried since they are only about half merino wool.

    good quality, poor sizing

    • Familiarity: I gave it as a gift but have feedback to share
    • Fit: Runs large

    Smartwool's size chart has the womens medium socks fitting a 7-9.5 womens shoe size. Got these for my wife who's usually an 8 or 8.5 and the medium was loose to the point that it bunched up behind the heel. The socks seem like they'll hold up really well and be really comfortable in the right size but just plan on sizing them smaller than smartwool's chart indicates.

    Smartwool PhD Outdoor Micro Sock

    • Familiarity: I've put it through the wringer

    The Smartwool PhD line are some of my favorite socks, and these were no exception. I use these for hiking and running. Keep my feet cool and I like the snug support under my arches.

    Improved design

    • Familiarity: I've used it several times

    Some of the same great things are still there about this version of Smartwool's sock compared to earlier versions- anti-stink wool, fun colors, nice and fitted- but I just wanted to comment that the new toe box, which is tapered and not square, is much better. I wear size 7.5-7 women's and size M is great for me. I wear these running and also for everyday wear. It takes a couple wears before you have to wash them.