The Smartwool PhD Nordic Medium Sock is a highly technical sock designed specifically for cross-country skiers for cold weather. Smartwool internal lining to manage moisture, temperature and odor; strategic mesh zones for maximum ventilation, and Duroyarn reinforcement for added comfort and durability. WOW technology puts wool in high density impact zones to reduce abrasion and shock, 4-Degree Fit System creates bands around the ankle, arch and instep for performance fit that lasts all day. Smartwool did pressure sensors to test athletes' feet in a variety of conditions to map out pressure zones and used this data to fine-tune cushioning and ventilation areas to optimize fit, comfort, blister prevention and durability.
BNS skiers have used these socks extensively and are among our favorites for the high-quality, fit and durability.
79% Wool, 19% Nylon, 2% elastic
Height: Crew
| Adult Smartwool Size | US Men | US Women | Euro |
| Small | N/A | 4-6.5 | 34-37 |
| Medium | 6-8.5 | 7-9.5 | 38-41 |
| Large | 9-11.5 | 10-12.5 | 42-45 |
| X-Large | 12-14.5 | N/A | 46-49 |