The Merrell Calia GTX is a womens active shoe perfect for all manner of activities and even everyday wear. It comes with M-Select FRESH - non-chemical antibacterial odour control for long-lasting freshness. There is a Nylon slice beneath the insert for natural bend of the shoe. The M-Select grip provides excellent traction and stability., M-Select FRESH - non-chemical antibacterial odor control. Nylon slice beneath the insert for natural bend of the shoe., Midsole EVA. Cushioning Air Cushion., 4.5 mm lug depth. M-Select GRIP - excellent grip outsole pattern does not hold dirt., ,