Welcome to Boxers Choice! At Boxers Choice we have developed a more natural feedback and realistic impact penetration action filler material for punching bags.  We have found that many of the other filler material such as: Hay, Rags, Foam Rubber or combination of these fillers just cannot provide the same results of our product. After using the product ourselves we also found less aches and pains on our wrist and hands.  In many cases our workout lasted longer without the fatigue we encountered with other products. If you are just now looking for a filler for you new punching bag or refilling your old punching bag your first choice should be "Boxers Choice" filler.