Smartwool PhD Outdoor Light Crew features Reliawool Technology for improved durability in the heel and toe and the 4-Degree Elite Fit System, to keep the sock in place and giving you all-sport versatility.
- New 4 Degree Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place
- Patent pending ReliaWool Technology in high impact areas provides the longer lasting protection to keep feet comfortable
- Strategically placed mesh ventilation zones provide ventilation for temperature and moisture management
- Flat knit durable toe seam for high burst strength
- 2x1 ribbed welt
|4 Degree Fit System:||The 4 Degree Fit System in the Smartwool PhD sock is a proprietary four-point sport supportive system that provides an incredibly secure, comfortable fit around the heel, arch and instep.|