What material are NFL game pants made of?

100% Polyester.
I own a pair of used Miami Dolphins pants. The pants are made in Berlin, Wisconsin by Ripon Athletics under the Reebok brand. I'm not sure if there is a competing brand of pant also in the league (I know players where helmets from different manufacturers). From what I understand though is that these are the standard NFL game pants.

All NFL Uniforms are Manufactured by Ripon (Pants and Jerseys). The licensing agreement currently belongs to Reebok but Nike will take over in 2012. Before Reebok purchased the exclusive agreement with the NFL individual teams had their own agreements, which is why there were team with Nike, Reebok and Puma logos on their uniforms. The licensing was different but the manufacturing was the same.