Feels as great as your favorite slipper but is designed to perfectly fit every inch of your foot. The New Balance sneaker incorporates superior cushioning, support, durability, and traction. Features of the 660 Running Shoe are A. C. E. (see chart below.) Also features is an injection molded EVA mid-sole for lightweight cushioning and a synthetic mesh upper for breathability. Glossary: A.Abzorb® - Provides Pure Cushioning And Energy Displacement. B.Absorb® EX - Premium absorb cushioning and energy displacement encapsulated in engineered thermoplastic. This visible technology is designed to provide optimal cushion, comfort and stability. C.Stability Web® - Delivers superior system in the midfoot and reduces the weight of the shoe. D.C-Cap® - Compression molded EVA for cushioning and flexibility. E.N-Durance® - Rubber compound for maximum durability in high wear areas. F.N-Lock® - Enhances midfoot support. G.Abzorb® SBS - Offers the ultimate cushioning for the performance athlete.