ASICS Women's Gel-Sonoma 2 Trail Runner 100% Textile and Synthetic Imported Rubber sole Shaft measures approximately 2.55" from arch SpEVA Midsole Material: Improves bounce back characteristics and decreases midsole breakdown. Trail Specific Outsole: Reversed lugs provide uphill and downhill traction on all types of terrain. Rearfoot GEL Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to midstance.