Push your limits with the Under Armour HeatGear long sleeve shirt. Featuring the original ultra-cooling fabric, this thicker compression layer offers a second-skin fit that keeps you protected and agile during high-intensity training. The 4-way stretch material ensures you stay dry and comfortable while focusing on your performance goals.Material & CareSize & FitLong training days, game-day layering, and active routines call for a top that stays light, cool, and locked in. The Under Armour HeatGear OG Compression Long Sleeve delivers that signature close-to-body feel with smooth stretch fabric that helps wick sweat, dry fast, and move comfortably through every rep, practice, or shift. Size & Fit GuidanceFor the best fit, we recommend choosing your usual size for the intended ultra-tight compression feel. Reviewers often describe it as true to size and snug without feeling restrictive, while those who prefer a little more room sometimes size up. Best ForBest for workouts, team sports, and everyday layering when you want lightweight coverage that stays cool and close to the body. Styling & VersatilityClean, streamlined, and easy to layer, this long sleeve works under jerseys, uniforms, and everyday workwear while still looking sharp on its own. Reviewers also like it for everything from gym sessions to outdoor activity and all-day wear. Break-In & DurabilityThe smooth fabric feels comfortable right away and needs little to no break-in. Reviewers also note that it washes well, keeps its feel through frequent wear, and continues to dry quickly. Care & MaintenanceWash after training and tumble dry as needed; reviewers say it holds up well to regular laundering and is ready to wear again fast.