Hard hat - kataboshi yugake

...Yugake is a glove-like object worn on the right hand when shooting a bow. It is made of deerskin and its shape and structure vary depending on the purpose of the shoot. Modern yugake are divided into three types, four types, and various types. There are also two types: hard-capped yugake, which has a hard cap (thumb), and soft-capped yugake, which has only a leather belly.
[Shooting]
There is a set way to shoot an arrow, and this is called the shooting method.

*Some of the terminology that refers to "hard hat gloves" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…弽（ゆがけ）は弓を射る場合に右手にはめる手袋様のもので，鹿革で作られ，射の目的によって形や構造が相違する。現代の弽には三つ弽，四つ弽，諸（もろ）弽とがあり，また，帽子(親指)を堅くした堅（かた）帽子弽と腹皮をあてた程度の柔（やわらか）(和)帽子弽とがある。弓矢
［射法］
　1本の矢を発射するには定められた方法がありこれを射法と呼ぶ。…

※「堅帽子弽」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報