EXTREME ATV Sand Drags @Newtown Dragway August 2019 YouTube Performance Poplin Sport ShirtBrunson Check: Shy Blue. Introducing our most comfortable performance button downs yet. We managed to make our performance fabric even softer by utilizing rayon from bamboo. This lightweight shirt is a testament to the versatility of our clothing. The classic button down look is perfect for work, plus UV protection and easy care allow it to seamlessly transition into a day outdoors. Pull it out of the dryer and you're off to the office or your next excursion.