Not sure why but it doesnt really bother me. I bought two. Can be used as a seat I hope they last. This boxing game makes you work up a sweat like never before. Fits as it should and is very comfortable to walk in without being clunky. if I had known I was only going to get one 12 pound weight I would not have paid the money I did. The instructions they provided were very basic and almost useless but gave just enough clues to figure it out. Just need to see its durability that thing is to be check over the period of time. One center of belly, and one on eachside for extra back support and to keep tighter grip then other belts.