i have ridden mx for 30 years.this is the best sock for mx boots period.the material is coolmax.the length comes up over the knee & acts like a liner for knee braces.highly recommended!
The Klim Sock is engineered to move moisture away from the skin and keep rider's feet dry. The Klim Sock features industry-leading Polyamide for longevity and Lycra for all-day comfort. Elastic is added to the top of the ankle and arch to keep the sock planted firmly to the rider's foot. A thermal terry liner makes this the most comfortable sock on the market.