Because of fleece, which is polyester, it's rare to find a 100% cotton sweat. a 90/10 or 80/20 is about as close as you get.
That being said, there are 100% cottons out there. But as you are finding out, they are hard to find.
That being said, there are 100% cottons out there. But as you are finding out, they are hard to find.