ASICS Men's Gel-kahana 8 Trail Runner 100% Textile and Synthetic Imported Rubber sole Rear foot GEL Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to instance. speva Midsole Material: Improves bounce back characteristics and decreases midsole breakdown. DuoMax Support System: A dual density midsole system positioned to enhance support and stability, positioned sport specifically. DuoMax Support System: A dual density midsole system positioned to enhance support and stability, positioned sport specifically. Trail Specific Outsole: Reversed lugs provide uphill and downhill traction on all types of terrain. Fit Tip: If between sizes, order 0.5 size up ; Weight: 11.9 oz ; ASICS GEL-Kahana 8 is made for neutral- Foot Type:Normal size arches , Over- Foot Type :Low arches or flat feet.