PhD Performance at the Highest Degree

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Smartwool® PhD® Socks

Our category-defining line of elite performance Merino wool socks.

They are the epitome of our ‘go far, feel good’ philosophy. We’ve spent over two decades designing, testing, and refining the activity-specific performance sock innovations and technologies incorporated into each pair of Smartwool® PhD® socks in order to make them the one variable you won’t have to worry about.

They are the x-factor, the multiplier, and the key to the equation.

Indestructawool

Indestructawool™
technology

Designed to break limits

Our new, patent-pending Indestructawool™ technology isn’t just something we added to our performance socks, but a whole new way to build them. We’ve developed a new, much more durable knitting technique that enables 30% more choss-filled approaches, gut-wrenching descents, and paradigm-shifting summits. You push yourself to new limits, so we thought we’d push our Smartwool® PhD® socks to new ones too.

Elite Fit

4 Degree™
Elite Fit

X marks the spot

The iconic x-patterned 4 Degree™ elite fit is one of our key technologies. It unites all activity-specific Smartwool® PhD® socks from cycle to mountaineer and beyond. It’s our locked-in, blister-repellent, ready-to-go platform that enables less slippage and more summits—helping you to not only go far, but to go fast, go freely, and go ferociously.

Activity Specific Mesh Zones

Activity-Specific Mesh Zones

Our ventilation zones were made to dump heat and help keep you on your feet longer so you can enjoy even more road/trail/climb time.

Women's Specific Fi

Women's Specific Fit

We’re not just changing our socks’ color to pink and calling it good. Our industry-leading women’s specific fit is crafted to provide more comfort and performance for women with its narrower fit and shallower heel.

Seamless Toe

Virtually Seamless™ Toe

This feature is knit to minimize blisters, hot spots, and in-shoe discomforts while you cycle, run, and hike your way into the wilderness.

Dialed-in Cushioning

Dialed-in Cushioning

Whether you want an extra buffer from the trail or like to run light and fast, we designed our different cushioning levels to accommodate your needs.

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Elite Fit

ZQ-Certified
Merino Wool

After 25 years, Merino wool is still our secret sauce. It helps regulate body temperature, moves moisture away from your skin at a vapor level, and resists odors. Our PhD® socks even use higher-quality, finer Merino wool in order to further increase durability and softness.

THE ZQ DIFFERENCE

Happy sheep grow better wool
ZQ-certified wool is a New Zealand program that ensures the highest-quality fibers while elevating animal welfare, environmental care, and social sustainability. It’s good for our products and even better for the sheep.

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1 Elite category
1 Elite category

ACTIVITY-SPECIFIC. ADVENTURE-READY.

Just like an alpine race ski or a set of quickdraws, our Smartwool® PhD® socks are engineered for specific tasks to make your adventures more comfortable and more confident.

ACTIVITY-SPECIFIC.
ADVENTURE-READY.

Just like an alpine race ski or a set of quickdraws, our Smartwool® PhD® socks are engineered for specific tasks to make your adventures more comfortable and more confident.

Hike

Made for long treks and grueling hikes, our PhD® Outdoor socks are the perfect combination of comfort and performance.

EXPLORE OUTDOOR SOCKS

Run

Whether you’re tackling trail, road, or the unknown, our fit-focused run PhD® socks were made to stay in place all 10k long.

EXPLORE RUN SOCKS

Cycle

Snug, secure, and soft, our PhD® cycle socks were designed to maximize comfort while cutting down on bulk for a dialed-in, road-ready, trail-worthy fit.

EXPLORE CYCLE SOCKS

Mountaineer

With 20-30mmHg of graduated compression and an over-the-calf fit, your feet will be the last thing on your mind as you hang, clip, and climb your way to any summit.

EXPLORE MOUNTAINEER SOCKS

Approach

With extra padding around the ankle, our PhD® Approach socks were made to complement approach-style shoes and help protect your feet from chossy, scree-filled scrambles.

EXPLORE APPROACH SOCKS

Ski

Our PhD® Ski socks are designed to minimize bulk for a dialed ski boot fit while still providing sculpted shin cushioning to maximize comfort on steep descents.

EXPLORE SKI SOCKS

Snowboard

Our over-the-calf PhD® Slopestyle socks are made for snowboard boots with less ribbing for all-day comfort and performance.

EXPLORE SNOWBOARD SOCKS

Nordic

Our Nordic socks feature extra vents to keep you from overheating on long winter outings—making sure you can go far while still feeling good.

EXPLORE NORDIC SOCKS

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