100% nylon diamond back mesh body and 100% nylon dazzle sleeves and yoke for team color. 100% polyester diamond back mesh body and 100% polyester dazzle sleeves and yoke for white. 100% polyester flat knit rib collar and 100% polyester engineered stripe knit insert for select teams. Sports jerseys are grouped into certain categories. First there is what is called the "authentic" jerseys. These jerseys are the ones that were actually worn by the players. It is hard to come by but if a fan manages to get hold of one, then he likely becomes the envy of his friends. Can you imagine the looks you would get if you have Tom Brady's #12 jersey? As mentioned earlier, authentic jerseys are hard to obtain so you can opt for a "replica" jersey. This type is manufactured but looks just the like a certain player's jersey. And if you don't want either one of those, you can always have one made for you. tags: 2010 PRO Bowl Pittsburgh Steelers James Harrison AFC Jersey, NFL jerseys ,2010 NFL Pro jerseys $19.99