The ASPIRE™ Line is thin and light for serious runners, yet still perfect for athletes of any sport. Our Managed Compression™ prevents bunching and hot spots by supporting all 3 arches in the foot. Our Linked-Toe technology prevents blisters by eliminating bunching in the toe-box. The result is a sock designed to fit your feet perfectly while helping you do what moves you. The One sock cut fits just above the cuff of the shoe with a little sock exposed around the whole ankle. Swiftwick sizing is based on your corresponding shoe size. Please refer to the size chart below: