Unisex

This all-purpose sock was designed for rugged day hikes or moderate backpacking. An arch brace holds the sock in place and adds additional support. A flat-knit toe seam keeps you comfortable.

For a sock that has it all, look no further: the PhD Outdoor Medium Crew offers fit, comfort and durability wrapped together in one smart sock. Featuring Indestructawool technology for ultimate durability in high wear areas, the 4 Degree elite fit system...

When it comes to running socks, we pull out all the stops to keep making improvements on our products. With brand-new Shred Shield™ technology to help improve wear in the toe box, our PhD® Run Ultra Light Micro socks feature the 4 Degree™ elite fit...

An arch brace helps holds the sock in place and adds additional support, while a flat-knit toe seam keeps you comfortable throughout the day. Perfect for moderate hiking or aggressive walking.

An ankle-high powerhouse, the PhD® Outdoor Light Mini is made for mileage. Great for long summer treks, it combines support, stretch, and recovery. Featuring Indestructawool™ technology for ultimate durability and the 4 Degree™ elite fit system for a...

Heavy full-cushioning provides shock absorption, offers insulation against the elements, and supports under weighty loads. An arch brace holds the sock in place and adds additional support.

The PhD Outdoor Light micro is made for the trail. Featuring Indestructawool technology for ultimate durability, we've designed these socks to outlast your greatest adventures. And with features like mesh zones for maximum breathability, a Virtually...

When you 've got lots of miles to cover but only want the minimum between your foot and boot, the PhD® Outdoor Ultra Light Crew is the perfect trail companion. With our new Shred Shield™ technology for reduced wear from toes, 4 Degree™ elite fit system...

When you 've got lots of miles to cover but only want the minimum between your foot and boot, the PhD® Outdoor Ultra Light Mini is the perfect trail companion. With our new Shred Shield™ technology for reduced wear from toes, 4 Degree™ elite fit system...

For the vertically inclined, the PhD® Pro Approach Mini combines carefully designed comforts with rugged purpose. Made with insights from iconic alpinist Conrad Anker, these socks feature specified cushioning to help protect feet from footwear friction,...

When you're out there, the last thing you want to think about is your feet. That's why we made the PhD Pro Medium Crew with...

Our best fitting, most advanced run socks yet, we packed years of testing, prototypes and running smarts into these socks. Featuring Light Elite cushioning in the ball and heel of the foot for ultimate shock absorption with minimal in-shoe volume,...

Experience durability at its peak with the PhD® Outdoor Light Crew. Featuring Indestructawool™ technology, a patent-pending wool-based durability construction, these socks are ready for any adventure on your list. Plus, with redesigned mesh zones, a...

When you're out there, the last thing you want to think about is your feet. That's why we made the PhD® Pro Light Crew with Indestructawool™ technology, a 4 Degree™ elite fit system, and body mapped mesh vents for breathability. So you can escape without...

Featuring Light Elite cushioning, these socks contain targeted cushioning placed only where runners need it most, on the ball and heel of the foot. We packed these socks chock full of smart features like our 4 Degree elite fit system, men's-specific mesh...

Extra-heavy cushioning will keep your feet warm and dry when you're mountaineering, ice climbing or multi-day backpacking. Arch brace holds the sock in place.

Our best fitting, most advanced run socks yet, we packed years of testing, prototypes and running smarts into these socks. Featuring Light Elite cushioning in the ball and heel of the foot for ultimate shock absorption with minimal in-shoe volume,...

You don’t sneak up on anything if you’re not light on your toes. Our PhD® Hunt Light Crew makes it so. Light cushioning and our 4 Degree™ elite fit system, which uses two elastics for greater stretch and quick recovery, keeps socks in place so you can...

For the vertically inclined, the PhD® Pro Approach Crew combines carefully designed comforts with rugged purpose. Made with insights from iconic alpinist Conrad Anker, these socks feature specified cushioning to help protect feet from footwear friction,...

It's time to take "burr" out of your running vocabulary. Stride out in our PhD Run Cold Weather Mid Crew. A Merino blend and mesh zones designed for runners help keep your feet warm during long winter runs. With a run-specific profile and our 4 Degree...