Treat your feet to all-day comfort with the Performer Nitro Paddock. Top-of-the-line Nitro technology creates a boot with unmatched flexibility, stability, and comfortPerformer Nitro Paddock Boot Product Features : Shock Shield® diffuses heel strike impact to minimize fatigueNITRO™ stabilizing frame for support with forefoot flexibility, Water-resistant leather stands up to the elements and delivers lasting durability, Removable NITRO™ insole for shock absorption and rebound, Duratread™ sole with rider-tested traction zones, Padded collar and tongue, Front lace closure with ankle flexion notchesLocking speed lace hooks with lace lock at top Women's Performer Nitro Paddock Boots in Black, Size: 5.5 B Medium by Ariat