Women's 2XUA(R) Elite Training Sock :: Powered by 2XU Compression technology, the Training VECTR Sock features 2XU's proprietary X:LOCK support system to optimize foot strike and push off, while also preventing abrasion. Employing 2XU's X:BLEND fiber formula, this sock utilizes Celliant yarns - the world's first technical textile proven to thermoregulate body temperature and promote oxygenation of body tissues. Equipped with the Training VECTR Sock, athletes will enjoy enhanced foot performance and faster recovery.