This is the go-to shirt for guys who want a fitted, athletic look without sacrificing comfort. Made from a super soft and stretchy blend of 95% cotton and 5% spandex, it moves with you. It's designed to be close-fitting – think a muscle or compression fit – so it hugs your body and shows off your shape, making it ideal for the gym, running, cycling, or any workout. But it's also thin and breathable enough to wear as a casual layer under a jacket or on its own. The long sleeves are great for cooler days or sun protection. A VERY IMPORTANT SIZING NOTE: This shirt runs small and tight by design. The labels are Chinese sizing, so ignore the tag inside. Please CAREFULLY check the detailed size chart in the description. If you prefer a looser fit or are between sizes, we strongly recommend ordering one size up. A quality, versatile staple for any active guy's wardrobe.