The Everlast C3 100-Pound Foam Elite Heavy 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 foam's closed-cells also reduce moisture transfer from the foam padding to keep your gloves dry during use. This everlast 100-pound heavy bag's custom filling of natural and synthetic fibers blended with sifted sand allow excellent shock absorption. The Everlast 70 lbs Heavy Bag Kit is your key to fitness.