Airing or “sunning” a futon is an important part of using it. As futons are made only from cotton, they need to breathe, air out, and fluff up. The UV rays kill microscopic bugs and allow moisture to dissipate, thereby preventing mildew and mould from growing.
On sunny days in Japan it is common to see futons hanging out of windows and on balcony banisters, secured with plastic clips.
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