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Over-the-calf, heavyweight hiking socks for cold weather.

Before you step out of your tent, switch out of your sleeping socks and into the SmartWool PhD Outdoor Heavy Over The Calf Socks. Designed for comfort and warmth in chilly temperatures, these over-the-calf socks feature a fabric blend of breathable, moisture-wicking, and quick-drying merino wool plus nylon and elastane for superb on-the-trail comfort.

  • Merino wool, nylon, and elastane fabric blend wicks moisture away from your feet for increased comfort, dries quickly, and breathes exceptionally well while you hike
  • Merino wool's antimicrobial qualities inhibit feet funk while elastane fabric offers comfortable stretch
  • Over-the-calf sock design provides comfort in high-cuff hiking boots
  • 4 Degree Elite fit system uses two elastics for greater stretch and recovery to keep the sock in place
  • ReliaWool technology in high-impact areas provides longer lasting protection to keep your feet comfortable
  • Strategically placed mesh ventilation zones supply ventilation for temperature and moisture management
  • Flat-knit, durable toe seams for high burst strength
  • Overall Height: 14in

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Here's what others have to say...

5 5


  • Familiarity: I've put it through the wringer
  • Fit: True to size

These are seriously the most amazing socks. I originally got them for my husband to wear while snow shoeing and other out door activities... and i stole them and wear them everywhere. They are so warm and they have a cool little feature; In the crease in between your foot and you leg the sock is thinner so that it doesn't bunch or get tight in your shoe. Totally awesome. GET THEM

5 5

Super Warm Socks

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

Got these in a L for my 11eeee feet. They fit well in the foot. Aren't quite as high as other Smartwool OTC socks, most come up to just under my knee, while these are an inch or so lower. They stay up well and aren't too tight around the calf. They are very comfortable socks and are super warm all the way up the calf. My only wish is that Smartwool would make a sock with heavy cushion in the foot and mid-weight cushion from the ankle up. For me that would be the perfect winter sock, but these are excellent socks for the colder winter temperatures or for just keeping your feet warm while chilling around home in winter.