The PhD Ski Medium has the improved 4-Degree Fit System - new reinforced z for maximum warmth, fit & durability. • 4-Degree Banded Fit System for all day performance fit • WOW Technology in High Density Impact Zones to reduce shock & abrasion • SmartWool inside for moisture, temperature, and odor control • Duroyarn™ reinforcement for added comfort & durability • Strategic Mesh Zones for maximum ventilation • 78% Wool, 21% Nylon, 1% Elastic |