it can be supposed that the support for ecchu fundoshi gathers because ecchu fundoshi are the absorbent undergarments which are suitable for the natural features of japan with the high temperature and high humidity . 高温多湿の日本の風土に合った吸湿性の高い下着として支持が集まるものと推測される。
manufacturing process of koji (rice malt ): add seed malt to the mixture of steamed soybeans and smashed wheat with the mix ratio of 1:1 , and produce soy-sauce malt through culture of it for three to four days under high humidity . 製麹（せいきく）工程 蒸煮大豆と割砕小麦を約11で混合したものに種麹を加えて混ぜ、高湿度下で3・4日程度培養を行い醤油麹を作る。
it is certain that there exist the fanciers even now who uphold the function and effectiveness that fundoshi bring about in the japanese climate with high temperature and high humidity since elastic is not used for fundoshi unlike underpants . パンツのようにゴムを使わず、高温多湿の日本の気候で褌の持つ機能や効能を支持する愛好家は現在でも確かに存在する。
however , the structure of seiyo-kan buildings with its high ceilings and closed spaces was not suitable for the japanese climate in which temperatures fluctuate considerably throughout the four seasons with frequent rains and high humidity . 天井が高く、開放性が低い西洋館の造りは四季の気温の変化が大きく多雨多湿の日本の風土とは必ずしも適合しない面があった。
