Many in the rings cited above are which is available from mainstream jewellers and are not hard to be able to. These light weight robes are often a cotton/polyester combination for wash and wear ease. https://tcjcublv6sahj5bcxp2zieqjryys2tvqoqy54yyxlppwpo2rqhvq.cdn.ampproject.org/c/s/elearning.maniatech-academy.co.uk%2Fblog%2Findex.php%3Fentryid%3D228838