Takahashi Kimono Kobo Usotsuki Collar With Uzura Han-eri (Half Collar) - Size M *The han-eri is 100% polyester. *Please refer to the last photo for the material of the collar itself. The back panel has been hand-sewn to adjust the size. I sewed and adjusted it intending to wear it, but I didn't use it. The thread can be removed.