Kizik Heathered Grey Madrid Eco Knit Sneakers Women’s 8.5 Men’s 7 Comfort + sustainability? Yeah, we did that! 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. You’ll call it your new favorite shoe. Excellent used condition. Some light wear on soles. On spot on insert inside shoe.