Let's break down how great these socks really are. "PhD" means they're smart. Not smart like you and me, but smart because they fit better than any other sock. "Outdoor" means outside, where these socks perform at their best. "Light" means they have just a little cushioning, on these socks its on the bottom and the back of the foot. "Micro" means they're short, really short.
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