Carrying an extra heavy full cushion all the way over the calf, our Extra Heavy OTC promises comfort and performance dawn to dusk. Features: WOW Technology in reinforced sole for maximum comfort and durability SmartWool Fit System with arch and ankle support 3x1 rib leg Heavy full cushioned leg and foot Flat knit toe seam Materials: 81% wool, 18% nylon, 1% elastic Height: over-the-calf Cushioning: extra heavy full-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.