The material is silk. This is a stylish and fashionable obi with a calm atmosphere. It is clean with no noticeable stains. It's reversible, so you can enjoy both sides. Size: 9.5 x 380 cm Hakata obi is easy to tie and doesn't easily come undone because of the silk. Please understand that this is stored at home. I have other items for sale as well. Please take a look here. #emi obi