Performance Fit: No slipping, no bunching, and no blisters. True Seamless: Undetectable seam fusion for an ultrasmooth, invisible feel. Fine Gauge Knitting: Unprecedented durability and Darn Tough's unique "put it on, forget it's on" feel. Over the calf: the name says it all. The ultimate height for keeping the outside, out. Made in the USA with yarns from America and around the globe - Every pair of socks is knit in Vermont - the perfect testing ground for the finest premium all weather performance socks.