Kazik Grey Madrid Eco Knit Hands Free Slip on shoes Womens Sz 7 Men's 5.5 unisex. The greatest shoe!! In excellent condition. Hands-free technology. You can slide your shoe on without ever having to touch them. The Madrid is fashioned with an environmentally friendly knit upper made from 100% recycled plastic bottles. It's got a four-way stretch that makes it breathable (goodbye, sweaty feet!) We call it Eco-Knit