HOKA ONE ONE Hoka Constant Women's Running Shoes fabric Rubber sole Shaft measures approximately 1.9" from arch Lycra ComfortFrame Upper - Delivers an adaptive, comfortable fit. Lycra Tongue - Helps provide a frictionless, customized fit. Asymmetric Lacing for Reduced Tongue Pressure TPU External Heel Counter - Provides Support. Late Stage Meta-Rocker Geometry - Provides improved stability.