Your martial training and skills as a adventurer has served you well. As a result, you learn one Fighting Style option of your choice from the fighter class. If you already have a style, the one you choose must be different.

Whenever you reach a level that grants the Ability Score Improvement feature, you can replace this feat’s fighting style with another one from the fighter class that you don’t have.

• Wearing medium armor doesn't impose disadvantage on your Dexterity (Stealth) checks. 
• When you wear medium armor, you can add 3, rather than a 2, to your AC if you have a dexterity of 16 or higher