The Nitro Max stands out and stands supremely comfortable with Ariat's premium Nitro technology built right in. This lightweight combination of flexibility and support cushions and stabilizes the foot for optimal performance. Nitro technology for targeted stability and lightweight performance. Nitro insole with lightweight open-cell cushion. Revolutionary Shock Shield diffuses heel strike impact for maximum shock absorption. Mesh X-Static pure silver lining for permanent anti-odor performance.