What`s up boy`s?the best thing for mawashi would be fire hose that the fireman use,the practice mawashi`s are accually canvas material we fold them the thickness.Do alot of sumo squats that will break you in the sumo form,for example the 15 yearold boy`s that join do like 500-800 a day so that a pretty hard,so I advise you boy`s to do 300 everyday,the next time you write me give me an address so I can send you boy`s some idea of sumo work out.