Knitted, Acrylic Very comfortable and has a nice tight weave so it has structure. Looks great with skinny jeans and boots! It is a baggy fit New without tags Small: Soulder---20.67" / Bust---37.44" / Length---26.52" / Sleeve Length---21.45" Medium: Soulder---21.06" / Bust--39.00" / Length---26.91" /Sleeve Length---21.84" Large: Soulder---21.45" / Bust---41.73" / Length---27.30" / Sleeve Length---22.23" X-Large: Soulder---21.84" / Bust---43.68" / Length---27.69" / Sleeve Length---22.62"