Running Thorlos feature maximum shock absorption and comfort for longer training runs on rough roadways and trails. High shock absorption and cushioning at the ball and heel of the foot ease the impact of running over bridge gratings and rocks. Added protection at the toes reduces callouses and "runner's toe". Foot Health yarns wick moisture away from your skin, keeping feet drier, more comfortable, and reduces blisters. 86% Acrylic, 12% Stretch Nylon, 2% Spandex PLEASE NOTE: Size JMX-11 is available in White/Platinum only. Size JMX-13 is available in White/Navy only. Size JMX-15 is available in White/Navy only.