The brawler is a skilled hand-to-hand fighter, when you take this feature you may add your proficiecy bonus to attack and damage rolls for unarmed attacks. In addition you gain the following abilities:
Stability. you are incredibly sure-footed. You gain a +4 bonus on all rolls made to resist being tripped, overrun, knocked prone, or pushed back by a bull rush attack.
Unhindered. you may treat any armor worn as one weight class lower in determining proficiency and disadvantages.