Your ability to roll with even the worst attacks means that armor would only slow you down. When you are not wearing armor, your AC is equal to 13 + your Dexterity modifier.
Protective Cover. If you take this trait twice, when you make a Dexterity saving throw or are targeted by a ranged attack, you can use a Reaction to have Advantage on the saving throw or impose Disadvantage on the ranged attack roll. You can use this feature a number of times equal to your Proficiency Bonus, regaining all expended uses when you finish a Long Rest.