Here are three main things to look for:
1. The lettering. It might have a few bubbles in it but shouldn’t look like it was glued by a seagull. I herd that it should be almost cardboard like.
2. the NFL in the front should be rubber composite and not stitched.
3. The jocktag should be almost sliver not grey and have fine edges from the laser cutting.
Other things to look for are the sales tag and the ventilated mesh. The tag should be black and not red and the mesh should be a little above the waist and on the site under the armpits.