Model Number:

SmartWool PhD Graduated Compression Ultra Light Socks feature dense cushion pads under the forefoot and heel for protection and comfort, while merino wool naturally helps manage moisture, temperature and odor on-the-run. Graduated compression of 20-30 mmHg stimulates blood circulation to decrease muscle recovery time, and Smartwool's updated fit with enhanced stretch feels comfortable every time you slip them on.


  • Black (001)


  • Pair of compression socks
  • Can be worn during exercise, or after for recovery
  • Medium-thin sock with no added cushion underfoot
  • 20-30 mmHg graduated compression to enhance blood flow, support muscles during exercise, and decrease post-run muscle recovery time
  • 4Degree Elite Fit System combines 2 elastic types paired with wool for greater stretch that improves performance fit
  • ReliaWool Technology at High Density Impact Zones reduces shock and abrasions with increased durability
  • SmartWool® natural properties help wick moisture, manage temperature and odor better than pure synthetics, helping keep you dry and comfortable
  • Strategic mesh zones for ventilation
  • Virtually seamless toe increases comfort
  • 14" tall over-the-calf cut


  • 48% Wool / 42% Nylon / 10% Elastane

Sock Performance Characteristics

Sock Thickness What's this?

  • Extra Thin
  • Thin
  • Medium
  • Thick
  • Extra Thick

Sock Height What's this?

  • No Show
  • Low
  • Quarter
  • Crew
  • Knee High

Customer Reviews

Comments: Great socks for wearing after longer runs, but not a big fan of these for longer runs (10+ miles). They've been giving me blisters on the underside of my toes compared to my other running socks (Balega, Asics, etc.) I'd recommended them for wearing around casually after runs to recover, but not really while running.
From: Bret, Davis, CA, USA. March 21st 2015

Comments: Great sock. I wear these for recovery after long runs or speed sessions. They are nice enough to wear with suits.
From: Brad, Charlotte, NC, USA