These are great quality. We got two sets and they have held up to two aggressive ninja brothers duking it out in epic battles without breaking, or really even showing any signs of wear. The straps are able to fit a 4 year old shorty and a tall 7 year old (both can lengthen straps to cross in the front instead of backpack style for more control during flying ninja kicks). Only thing to note, these things are pointed! They really do hurt when poked, so only proceed with true ninja caution.