Kizik Athens Unisex Hands‑Free Breathable Sneaker - Black BlackKizik Athens Unisex HandsFree Sneaker in Black Black is a knit, stepin sneaker with a springback Cage heel, breathable 4way stretch upper, and cushioned Rabbit Foam outsole for allday comfort. Full product details The Athens uses Kiziks HandsFree Labs Cage technology at the heel so you can step in without bending; the heel compresses and instantly snaps back to secure your foot. A 4way stretch knit upper in Black Black flexes naturally with your foot