The Wigwam IronMan Thunder Pro Low Cut (No Show) Socks are the ideal performance athletic socks for athletes that won't compromise on features and comfort. Like all of Wigwam's Pro Series socks, the IronMan Thunder Pro are designed to really keep your feet dry and blister free by lifting moisture out of the foot of the sock. X2O Acrylic fibers contain Chitosan, a natural odor-fighter that keeps your socks odor free. The Thunder Pro also contains Dri-release fabric, a synthetic fiber that drys extremely fast. Cushioning on the sole, toes, and heels, coupled with thin venting along the top of the foot ensure that your feet get all the support and venting that they need. And the IronMan isn't just a name — since 1994, Wigwam has been the official sock of the IronMan Triathlon.