Engineered to outpace the demands of urban running, this sock-fit shoe sports a ribbed lacing cage that locks your foot comfortably to the springy foam sole. Responsive Speedboard construction moves naturally with your stride to transform every heel strike into an explosive toe-off, with durable, high-abrasion rubber in the tread providing superior grip. Cushioning: absorbs impact and distributes weight for consistent, buoyant comfort under each step Energy return: transforms every heel strike into responsive, explosive forward movement Pull-on sock upper with external lacing cage Removable memory foam insole allows for custom orthotics Speedboard™ construction moves naturally with your foot to transform every heel strike into an explosive toe-off Helion™ superfoam cushioning delivers lightweight energy return even in hot and cold temperatures Recycled-textile and recycled-synthetic upper/ recycled-textile lining/recycled-synthetic sole Imported This product meets Nordstrom Sustainably Sourced Materials criteria: contains at least 30% sustainably sourced materials