Smartwool PhD Outdoor Heavy Crew Socks

Size Chart
Alpine Blue

Smartwool's SW001073 PhD Outdoor Heavy Crew sock is one of our favorite socks here at GoBros. With this sock Smartwool provides serious warmth and high-density cushioning, yet also gives us a fit that is never bulky and can be worn comfortably with causal and athletic shoes alike.

The addition of Indestructawool construction means these socks last longer. Like all Smartwool PhD socks, the Outdoor Heavy Crew promises a high-tech fit (this model includes the 4 Degree Elite Fit System which uses an elastic network to guarantee greater stretch and recovery) to comfortably keep your sock in place all day. The Heavy Cushion Outdoor Crew sock from Smartwool has a bump-free, virtually seamless toe seam for longevity, and comfort. Mesh Venting promotes breathability and moisture-management.

Smartwool's PhD Outdoor Heavy Full Cushion Crew sock is perfect for cold days on the trail or commuter train. Designed to manage moisture, regulate temperature, control foot odor to prevent blisters, and keep you comfortable wear after wear.


  • Crew Height (8.5" overall)
  • Heavy Full Cushion
  • 4 Degree Elite Fit System for an all-day performance fit
  • Indestructawool Technology features a Wool-Based, Patent-Pending Yarn and Construction Method for Exceptional Durability and Comfort
  • Smartwool inside for Moisture, Temperature and Odor Control
  • Strategic Mesh Zones for Breathability
  • Virtually Seamless Toe
  • Washer and Dryer Friendly
  • Replaces the SW046


73% Merino Wool, 25% Nylon, 2% Elastane

Sock Height

Crew Height Sock

Sock Cushion

Heavy Cushion Sock

Customer Reviews

Based on 7 reviews
Virginia Rollefson (Middletown, Connecticut)
Smartwool is great

Soft strong comfortable

Diane Hoffmann

PhD continue to be my favorite smartwool sock but like them all

Very well made, very comfortable, should last for years.

I never thought socks could be worth $25 a pair, but if any are, it's these! Very well made, very comfortable, should last for years. For me, the most important feature is the extra padding on the bottom, which helps relive my metatarsal pain. And they look good, too. Highly recommended!


Love Smartwool's! Warm, easy to care for, and so comfy!

Jessica M.
Great choices

Great pair of socks. Smartwool PhD are hands (or feet) down the best socks. You can get 3 weights: light, medium, and heavy, which covers any activity level. Light and medium are great for everyday use. And heavy can be for outdoor cold weather activities. But the best part of these socks it the way they hug your leg. The spandex in socks is perfect at keeping the sock in place during any activity. The way the sock fits snugly is the primary reason I purchase the PhD version of Smartwool socks. I use these socks from everything from work wear to snowboarding. They are just that versatile, and you can beat the fit or warmth.