From Vionic, the Winny Knit Gum Sole Lace-Up Sneakers feature: Soft breathable knit upper Received APMA Seal of Acceptance Stretch infinity lace Synthetic lining Built-in VIO MOTION Technology footbed with contoured arch support Lightweight EVA cushioned insole Durable synthetic gum outsole Approx. 0.375" platform height Approx. 1" heel height Imported.