This is a relaxed, deep, reversible casquette. The wide brim is perfect not only for keeping warm but also for sun protection. Size: Relaxed one size fits all Brim length: Approximately 6cm Brim width: Approximately 47cm There is a rubberized section at the back, about 6cm long. The material is unknown, but it is not itchy. (This is just my personal opinion) This hat can be hand-washed at home. It has been used, but there are no noticeable pills. Thank you.