A LOT of money.

Really though:
Authentic jerseys are high-quality jerseys is made of durable, quick-drying polyester metallic StretchAir fabric with dazzle inserts for that comfortable feel. They are officially licensed by its respected pro league. In simple terms, this is the real gear that the pro players wear. The names and numbers are tackle twilled on the jerseys for that true professional feel.

Replica jerseys are made of breathable, quick-drying nylon mesh and has a flat rib knit collar and armholes. They too are officially licensed by the sport leagues, but they are not the quality of jersey the pros wear. You will still find all your favorite players and teams. The number are not tackle twill like on the authentic versions. They are screen printed for simulated look and feel.

About $150 bucks!

replica's are sh1tty and silk screened, authentics have actual numbers sewn on like the players on the field wear, numbers are to scale, you would see if you had one in hand.

a lot of money

THE PRICE!!!!