Shrug On

As a full-round action, you can shrug yourself into the largest and most protective section of a suit of armor with which you are proficient. You gain half the armor's normal Armor Class bonus (rounded down, minimum +1). The armor's armor check penalty, maximum Dexterity bonus, arcane spell failure chance, and speed reduction apply as normal.

You can remove this hastily donned armor as a standard action. Putting on the rest of the suit requires the normal amount of time as if you were donning the entire suit hastily.

Prerequisites

BAB +1, medium armor proficiency