The Tsutsu is a part under a lot of constraints as it has to follow the movement of the wrist. Thus it has to give enought freedom to wrist while being resistant and not breaking too fast.
Tetknit : Material really fast to dry, used mainly for washable Bougu and part in contact with a lot of sweat. It is a synthetic material.
Orizashi : Material that dry fast and lighter than other material. The fiber are however more exposed. It is made from cotton dyied with Aizome.
Momen : Standard material used for the Futon of Bogu. It is made from cotton died with Aizome.
Velvet(Inside only) : The velvet is one of the most confortable material which can be used for Bogu, but it dries less easily and requires more maintenance.
Clarino/ Synthetic deerskin : Material with a look and properties close to deerskin.
Deerskin/ Shikagawa : The most resistant material used for Bogu. It allies a great sturdiness with great flexibility. It is, however, more difficult to dry than other material, and require more maintenance.
Chagawa : Normal Shikagawa which has been smocked to improve its resistance and durability. Well known for its unique smell.
Kongawa : Normal Shikagawa which has been smocked to improve its resistance and durability. It has been dye with Aizome. The smell is fainter that Chagawa.
Shirakawa : Bleached deerskin which has not been dyied. It is more delicate and flexible than Chagawa and Kongawa.