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  • SmartWool PhD Ski Ultra Light Sock Black
  • SmartWool PhD Ski Ultra Light Sock Smartwool Green

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  • SmartWool PhD Ski Ultra Light Sock Black
  • SmartWool PhD Ski Ultra Light Sock Smartwool Green

SmartWool PhD Ski Ultra Light Sock

sale $14.27 - $21.95

Free 2-Day shipping on orders over $50*

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    • Black
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    5.0 5 28

    28 Reviews


    Night skiing, anyone?

    Unless you've completely blocked it from your memory, you might remember your very first time on skis and the way you felt when you withdrew your pasty, clammy foot from a wet, frozen bunched-up cotton sock. The Smartwool PhD Ski Ultra Light Sock gives you maximum warmth without the bulk and without that horrible clammy wet-cotton feeling you've hopefully managed to erase from your mind.

    • Merino wool blended with nylon and elastane offers exceptional temperature control, flexibility, and support
    • Mernio wool's natural antimicrobial properties keep these socks fresh even if you skip a few washings
    • Merino wool regulates temperature so your body wastes less energy trying to keep you warm or cool
    • ReliaWool tech adds comfort and durability to high-impact areas
    • Mesh ventilation zones get rid of moist, overheated air
    • SmartWool's 4 Degree Elite Fit System uses two elastics for extra flex and compression
    • Compression tech helps energize your feet and prevent swelling
    • Item #SWL0748

    Tech Specs

    53% Merino wool, 44% nylon, 3% elastane
    Recommended Use
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Excelent base sock

    • Familiarity:I've used it several times
    • Fit:True to size
    • Size Bought: xl

    I used these as a base sock under my wool socks hunting this oct. this is the pair of smartwool fo me and i like it, the sock is quality and ultra thin, good stuff. i wear a 13 and xl was perfect

    Great socks, warm seasons

    • Familiarity:I've used it several times
    • Fit:True to size

    These socks are super comfortable, the PHD makes for a great tight fit and the weight of the fabric is great for warmer days. These are the best socks you can buy for skiing in my opinion


    • Familiarity:I've used it once or twice and have initial impressions
    • Fit:True to size

    I love smartwool socks. Yes, they are way too expensive for socks. But they are great socks. Very comfortable, don't stretch out so I can wear them for more than 1 day, and they last for a long time

    Best Ski Socks I have ever had

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

    These are the best ski socks out there. Too many people stuff their boots with some big honk'n sock and they cut off their circulation. Then they wonder why their feet are cold. The socks are super warm but ultra thin at the same time. Win win...

    Awesome socks...can't go wrong with SW

    • Familiarity:I've used it several times
    • Fit:True to size

    I struggle with socks and fit for the uphill part of my ski life. I bought these and a couple of others in an effort to obviate risk on an upcoming trip to do the Haute Route. The socks were awesome, and I just wish I'd bought more...even these socks get stinking after a couple of days in my nasty Nordicas.

    The best bar none.

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

    These socks are just the best, the fit is tight- as it should be. Lighter socks keep your feet warmer because they allow for better blood flow, and the PHD ultra light is thin without being flimsy, so your feet stay warm and the socks don't rip.

    As far as foot control, these are the best socks I've ever rode in. I ski park %95 percent of the time, and the control on rails and jumps with these socks are unsurpassed. Park rats- these are the socks for you.

    New Favourite

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

    Warm, comfortable and perfect for skiing and ski touring. I bought these for an expedition to Greenland. I had 2 pairs for 3 weeks and it was only in the last few days that any foot smells were an issue. They are comfortable and warm!

    Perfect Ski Sock

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

    I can't use anything else to ski in but these ultra thin smartwool socks! For those of you who require a thin sock this fits the bill, there is not any extra padding, cushioning, etc that so many ski/snowboard socks come with. Because they're merino wool they are fairly heat regulating, and I can use them multiple days in a row before they start to get smelly. They're pretty durable too, the few pairs that I've had for a long time (probably 5+ years, and mind you I easily ski over a 100 days a year) have yet to still get any holes in them.

    I wear a size medium in these socks and I wear a size 7 women's shoe. I have a pair of these socks in size small too and they're indeed a little too small. So these socks run true to size.

    Perfect thickness

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

    SmartWool is always great. I squeezed these into my AT and alpine boots with no problem and my feet stay happy and warm all day (and night). These socks are also very durable.

    Happy Feet

      My feet like these socks, a lot. The first time I used these socks was on a 7 hour long, 8+ mile day of Backcountry touring and these things are awesome. When it comes to Backcountry skiing in the early season it sometimes takes a bit to get in the groove of what gear you are going to wear for certain weather/distance conditions. After some time in these socks, I assure you that I will have these socks on my feet for most days. They are warm, light, and full of an abundance of merino. All that makes me want to wear these socks each and every time I tour.

      Sweet Sock

      • Familiarity:I've used it several times
      • Fit:True to size

      I have worn these socks for a few ski tours and they are great. They wick sweat very well and the thinness makes for a great fit in my boot. I wear a 10.5 size shoe and the large was perfect.

      King of Ski Socks

        After years of personal use with Smartwools, I finally got the guy some Smartwool ski socks, and he loves them. Again, super comfortable, lightweight, and keeping your feet as happy as it is possible when sitting all day in ski boots. Would definitely recommend these!