Designed in collaboration with ultra-runners, the PhD Pro Endurance is the sock that can go the distance with you. This sock features Indestructawool and Shred Shield technology that work against the hard wear and tear the additional mileage puts on them to help the sock keep up with your training and race days. Mapped flexibility and cushioning give you freedom and comfort where you need it most to keep you focussed on the goal at hand. read more
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