Smartwool PhD Ski Ultra Light Socks;

The PhD Ski Ultra Light was designed after our classic Ski Ultra Light, except with a 4 Degree elite fit system and ReliaWool technology to create our most comfortable and durable sock yet.

PhD:
Built for Performance in the Highest Degree

4 Degree Elite Fit System:
Uses two elastics for greater stretch and recovery to keep the sock in place.

ReliaWool:
Patented ReliaWool technology in high impact areas provides superior durability.

Mesh Ventilation:
Mesh ventilation zones provide additional breathability and moisture management.

Ultra Light Cushion:
Non-cushioned sole and leg for a close fit in tight-fitting performance boots