Thank you for viewing. This is a men's datejime (under-sash). It's reassuring to wear it under a yukata's heko obi (soft obi) as it tends to loosen. Of course, it can also be used under a kakuo obi (stiff obi). Material: Probably silk (no certification tag). Size: Width 5.5cm, Length 210cm. The 55cm from each end is thin, and the center has the crisp, firm texture characteristic of Hakata-ori (Hakata weave). It has been stored in a chest of drawers for many years, so there are fold marks (see image 2), but the condition is not bad. It's convenient to have one. Thank you for your consideration.