-Adult sizes (XS, S, M, L) are Next Level Apparel and are 80% cotton + 20% polyester
-Youth sizes (youth M, youth L) is Gildan Heavy Blend and is 50% cotton + 50% polyester
-Very comfortable material. I am very sensitive to certain clothing materials (itches me) but I could wear this sweater from sunrise to sundown!
-Youth L recommended for children 8-11 but may run large on younger and smaller kids
-Adult sizes will vary. Ashley/slimeyoda, a 16 year old smaller girl can fit into an adult XS, but prefers to wear an adult M for comfort. (I like my sweaters big and loose!)