You can never have too many undershirts, especially when they're this nice. Bread & Boxers made these from a thoughtful fabric blend — 94% organic cotton and 6% elastane — which means they're extra stretchy and equally comfy. With a tailored, slim fit, these'll look tidy and put together if you wear 'em to hit the gym or on a hike, but work just as well layered under pretty much anything.