The PhD Cycling Ultra Light ¾ Crew is Smartwool's most popular silhouette for cycling. Featuring our 4-Degree Fit System, this sock stays in place. SmartWool fibers add comfort, while WOW Technology increases durability and reduces shock and abrasion. Features: 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 Durayarn reinforcement for added comfort & durability Strategic Mesh Zones for maximum ventilation Materials: 68% wool, 29% nylon, 3% elastic Height: 3/4 crew Cushioning: ultra-light cushioned Why SmartWool? Efficient - You stay drier for longer because SmartWool wicks, absorbs and evaporates more efficiently than any other fiber, including synthetics. This is due to the exceptional moisture management properties of SmartWool. SmartWool's ingenious moisture management system ensures all day comfort. Versatile - SmartWool regulates your body temperature, keeping you cool in the summer and warm in the winter. No other fiber can match SmartWool's ability to retain necessary heat while removing any excess that may cause fatigue or discomfort. Tiny pockets of air, providing a buffering layer of natural air cooling or warming. SmartWool's natural climate control ensures comfortable performance in all conditions. Odor Free - The bacteria that cause odor can't build up on the SmartWool fiber. This means that even during intensive activity over extended periods of time you stay fresher for longer.