Petto Long Sleeve Under Gear Shirt is designed to provide a superior fit and professional profile while retaining the ease and comfort of a traditional undershirt. Made from state-of-the-art fabric, with wide-spun sections for underarm and back breathability and stretch. An efficient and effective shirt for any weather or environment, made to maximize your training regimen. You'll be comfortable, dry, and have a full range of motion for whatever challenge your workout throws at you. Flat seams and a printed label reduce friction, meaning you too can focus on the task at hand.