UFC Punching Bag punching bag is designed to provide professional level training for boxers. This heavy punching bag can also be used by individuals who box for fitness. The C3 (Contoured Closed-Cell Foam Technology) used in this Everlast heavy bag increases cushioning and force dispersion required by serious hitters, especially during intense workouts. The high-density closed-cells also reduce moisture transfer from the foam padding to keep your gloves dry.