The Kizik® Athens 2 Knit is a relaxed-fit, hands-free knit sneaker for easy everyday wear. The Internal Flex Arc lets you step in without using your hands. A 4-way stretch knit upper keeps it breathable and flexible, and a generous toe box leaves room for your toes. HandsFree Labs technology, Internal Flex Arc: A quick, effortless step-in, hidden inside the heel.