Pullover Hoodie Men Blend Fleece Long Sleeve Sweatshirt with Kanga Pockets

Is this really 80% cotton/20% polyester? Some people are complaining saying it's 100% polyester, is this true?

Is the size chart on the picture real? For us, is he slim fit or loose fit?

Im 6’1 at 178, do u think a large would fit better than a medium?

Is it U.S sizing?