The structure is a kind which is seen irrespective of yawarakaboshi or kataboshi, and kataboshi has no wrist reinforcment, which makes the movement of a thumb relatively free, and the thumb unlikely interfere with the movement of a string in "Kyudo-shaho hassetsu."
柔帽子、堅帽子の別なく見られる造りの一種で、堅帽子では手首の固めが無い事から親指の動きが比較的自由になる為、“弓道射法八節”に於いて弦の運行を親指が邪魔し難いとされる。