This was the official sideline hat for the Packers for Super Bowl XLV. After they won, of course I had to get it. It mainly serves as a yard or workout hat. I wore it to Planet Fitness this morning. It worked well to keep in my truck for marching band rehearsals when I used to be involved in that. Made by Reebok and consists of 84% nylon, 14% cotton and 2% polyurathan.