Synthetic sole. Shaft measures approximately low-top from arch. NEUTRAL: For runners who need a balance of flexibility and cushioning. Lightweight, engineered mesh upper is extremely flexible & breathable, with strategic support where you need it for a fast, sleek look. ¾ length bootie construction hugs the midfoot & forefoot, for a more secure, plush fit. Dual-layer Charged Cushioning midsole with minimal outsole rubber for the ultimate cushioned, flexible and lightweight ride. Solid rubber outsole covers high impact zones for.