New Balance Women's W755 Running Shoe 100% Synthetic and mesh Ndurance is a rubber compound for maximum durability used in high wear areas NLOCK is an integrated lacing and webbing system that provides optimal fit, support and security Dual-density collar uses both a softer density foam against the foot for cushioning, and a firmer density foam for support LIGHTNING DRY collar wicks moisture away to help keep your feet dry and comfortable Stability Web provides optimal arch support thats both rigid and lightweight while preventing midfoot flex