Mark Appleyard signature model. Engineered mesh upper design combines additional reinforcement in high stress areas such as the toe box, with more breathable panel construction in the quarter and vamp. Stretch mesh inner sock construction for a snug fit every time. Airolyte insole for long-lasting comfort. Phylon formula gives you a midsole that is extremely light for enhanced mobility. Lightweight Nitrocel™ airbag provides all-day comfort and maximum impact control.