The new LeMieux Carbon Air brings the latest in protection design with a smart and durable XC boot.fully vented XC boots allow air to flow through the boot to keep tendons cool. Cutting edge shock absorption and tendon support with a flexible poly-carbonate strike guard give these boots superior protection to prevent injury while still keeping a super lightweight profile. These boots are perfect to withstand the rigour of cross country and can also be used as tough everyday work boots.