A high performance, low volume sock for a precision fit. The Definitive Fit SystemTM delivers a close form fit and is coupled with light cushioning over the shin area for extra comfort in this high impact zone. Made from Le Bent&';s Signature Blend of Merino Wool and Bamboo Rayon, the ultra light weight rating of this sock offers exceptional breathability, superior warmth and comfort. Signature Blend of Merino Wool and Bamboo Rayon Definitive Fit System(TM) Ultra Light Construction