Be prepared for even the most high-impact gym workouts wearing the cushioned and supportive Ryka Studio D aerobic & fitness shoes. The flexible, low and lightweight profile allows for quick and nimble footwork. You’ll love the comfort of high-rebound and resiliency.Upper: Synthetic overlays provide lightweight support. Mesh offers breathable flexibility. Padded tongue and heel collar enhance comfort. Lace-up front offers an adjustable fit.Midsole: TPU shank provides torsional rigidity. Removable insole. Outsole: Rubber outsole offers flexible traction.