New Balance Women's WR1064 NBx Cushioning Running Shoe Synthetic and mesh Rubber sole N-ergy is a resilient engineered elastomer designed to provide shock absorption and responsiveness for the optimal ride Stability Web provides optimal arch support thats both rigid and lightweight while preventing midfoot flex ABZORB FL midsole foam with DuPont Engage and isoprene rubber LockDown Liner: an adjustable, internal liner that is integrated into the lacing to provide a custom fit and securely hold the midfoot