The men's Burton Phayse Merino Quarter Zip Base Layer is not your average base layer. It's the lightweight merino blend yarn that sets it apart from the crowd, offering real-world odor control, breathability, and temperature regulation. Wear it riding. Wear it hiking. Wear it anytime you need lightweight, low-profile warmth. It has you covered with all-natural temp regulation, odor control, and a soft, easygoing feel.