65% Cotton / 35% Polyester Blend The whole purpose of a blanket is to keep you warm and comfy, and nothing does that better then a good old fashioned pair of sweats. That is where the sweatshirt blanket comes into play. This heavyweight blend of cotton and polyester combined with its 50 x 60 inch size will have you ready to take a nap. It is almost 2 pounds of sweatshirt material, and yes, it has that great fuzzy interior we all love about sweats.