Smartwool PhD Outdoor Ultra Light Micro Socks

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Size Chart
Medium Gray
Light Gray
Desert Sand

Smartwool's PhD Outdoor Ultra Light Micro-Crew Socks are ideal for people without injury, and those who prefer a minimalist, light-weight feel. The SW001061 Outdoor Ultra Light Micro sock features Smartwool's newest Indestructawool construction and 4-Degree Fit System for outstanding fit and long-lasting durability. The SW035 is the update to the SW035 for all of you long-time Smartwool enthusiasts.

The SW035 PhD Outdoor Ultra Light Micro sock utilizes technology used in athletic footwear to improve fit, feel and performance to unheralded levels. As with all Smartwool socks, the Outdoor Ultra Light Micro sock features those famous Merino Wool fibers which provide moisture, temperature and odor control. Now with Indestructawool and mesh vents, this multi-sport sock will last and last while promoting dry, cool feet. Whether you're hitting the mountain or the gym, these discrete, hard-working socks are a nice option for the hottest days and when you want the lightest sock on.


  • Micro Crew hits at the ankle (1.5" overall height)
  • Ultra-Light Sock; No Cushion
  • Indestructawool Technology: a Wool-Based, Patent-Pending Yarn and Construction Method for Exceptional Durability and Comfort
  • Anti Odor
  • Moisture Management
  • 4 Degree Elite Fit System uses two Elastics for Great Stretch, Recovery, Keeps Sock in Place
  • Mesh Vent Zones: Open Mesh Knitting Patterns for Maximum Ventilation and temperature regulation
  • Virtually Seamless Toe
  • Update to the SW035


50% Merino Wool, 49% Nylon, 1% Elastane

Sock Height

Micro Height Sock

Sock Cushion

No Cushion Sock