For a sock that has it all, look no further: the Smartwool PhD Outdoor Medium Crew Hiking Sock offers fit, comfort and durability wrapped together in one smart sock. Featuring Indestructawool technology for ultimate durability in high wear areas, the 4 Degree elite fit system for a dialed fit and our signature Virtually Seamless toe for extraordinary comfort in any trail shoe. Medium cushioning provides impact protection and ultimate comfort on the trail.
Features
- Virtually Seamlessâ„¢ toe
- 8.5" overall height
- Sock Height: Crew
- Made in USA of Imported Yarn: 63% Merino Wool, 35% Nylon, 2% ElastaneÂ
Sizing Chart (shoe size reference)
| Sizes | US Men | US Women | Euro | UK |
| Small | 3-5.5 | 4-6.5 | 34-37 | 2-4.5 |
| Medium | 6-8.5 | 7-9.5 | 38-41 | 5-7.5 |
| Large | 9-11.5 | 10-12.5 | 42-45 | 8-10.5 |
| X Large | 12-14.5 | N/A | 46-49 | 11-13.5 |
Smartwool PhD Sock, Outdoor Gear Lab Top Pick, Hiking Sock
"The Smartwool PhD is a high-performance, fitted merino wool sock and winner of our Top Pick for Versatility. It is best used alone, a bonus for minimalists, but a fact that might dissuade buyers accustomed to a dual layer sock system. The PhD is ultra-versatile and comfortable in almost any conditions with the exception of extreme cold, similar to all other socks tested. We brought it everywhere with us in this testing period. "
Outdoor Gear Lab, 2017