The Patagonia men’s long sleeve base layer in bright blue is designed for performance and comfort. Made from lightweight, moisture-wicking fabric, it helps regulate body temperature by drawing sweat away from the skin, keeping you dry during intense activities. The shirt features a crew neckline, flatlock seams to minimize chafing, and a slim fit to provide a streamlined layer under outerwear. The vibrant blue color adds a pop of style while the medium size offers a snug but flexible fit, ideal for layering. • 100% polyester • 22.5” pit to pit • 14.5” chest • 26” shoulder to hem Measured lying flat, no visible flaws