Crocs Duet Clog Synthetic Imported Synthetic sole Shaft measures approximately not_applicable from arch Fully-molded Croslite material construction offers lightweight cushioning Dual-density design offers a softer footbed with a tougher outsole Ventilation holesfor breathability. Pivoting heel strap for a more secure fit Easy on-and-off. Customizable with Jibbitz charms Dual Crocs Comfort: Blissfully supportive. Soft. All-day comfort.