This is the top-of-the-line heavy bag from Everlast. This bag can easily withstand the most punishing forces without losing any of the resiliency of the fiber filling. This is made possible by the Everlast dual bag system. The system is composed of an inner bag made up of a 2" layer of poly-foam that not only adds protection but also provides a softer feel, and the outer bag, filled with a patented blend of fibers that absorbs shock and protects your hands from harmful jarring impacts. This bag comes complete with chains, "S" hooks, "D" rings and a swivel to hang it.