Smartwool PhD Mountaineering Sock Features:
The PhD Mountaineer Socks comes with Smartwool’s 4 Degree Elite Fit System for excellent comfort and support with four areas of banding to support the foot in the upper and lower instep, ankle and arch. A heavy weight outdoor sock with a merino wool, nylon and elastane mix for those who want a comfortable fit the PhD Mountaineer Sock has ReliaWool Technology in high impact areas to provide longer lasting protection. Strategically placed mesh ventilation zones help to prevent your feet becoming too hot while the PhD Mountaineer Socks have heavy cushioning in the heel and toe to give protect where it’s needed.
Great well designed sock, very warm, supportive and nice thick cushioning. Recommended for cold freezing temperatures. Not yet used enough to comment on durability but other smartwool socks seem fine.