Obi worn for practicing martial arts are a lot thinner and shorter than other kinds of obi. They come in different colours, and the colours show how skilled someone is in practicing martial arts. When someone becomes skilled enough, they wear a new colour of obi. Both men and women wear the same size and length of obi in martial arts, and they are not decorated with embroidery or dyes designs.= = = Nitrogen fixation = = =
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