Edgy yet cozy mostly cotton (although no longer tags showing that) substantial sweatshirt fabric with layers of gauze and I believe wool. This Studio B3 piece is so cool! It has a long band that adjusts the slouchiness of the neck. It says M on the tag but runs very large, more like a 14-16. If Lagenlook is your thing this is the piece for you! I wore it twice and although I love it, it’s just too big for me.