Product DNA The Fundamentals Close-hole mesh upper with ColdGear® Infrared lining for lightweight warmth Lightweight, external heel counter for additional support that keeps the back of the foot locked in place Dual-density Charged Cushioning® midsole for the ultimate blend of comfort & explosive energy return Full-length moulded sock liner forms to the foot, eliminating slippage & providing ideal underfoot comfort Solid rubber outsole covers high-impact zones for greater durability with less weight Offset: 8mm NEUTRAL: For runners who need a balance of flexibility & cushioning This product is not available for returns