'Equipped with thicker, more compressive, and ultra-cooling HeatGear, the Under Armour Heatgear OG Compression Shortsleeve is a must-have training gear you'd love to put on first and take off last. Crafted with four-way stretchy fabrics, this sweat-wicking short-sleeved T-shirt brings comfort and unrestricted movement. The tight-fit design with optimum muscle compression offers a body-hugging feel and improved performance. Featuring the original, thicker HeatGear fabric for maximum protection, the Under Armour Heatgear OG Compression Shortsleeve limits pinching, snagging, and chafing to help you achieve new personal bests. From training sessions to all-day layering, this compression top is built to keep you cool, dry, and supported without slowing you down. The Under Armour Heatgear OG Compression Short Sleeve pairs the brand's original, thicker HeatGear fabric with a tight, body-hugging fit for a smooth, locked-in feel that moves with you through lifts, practice, and everyday wear. Size & Fit GuidanceReviewers consistently describe a true-to-size, second-skin fit with firm compression. For the best fit, we recommend your usual size for a classic locked-in feel, or sizing up if you prefer a little more room through the chest, shoulders, or neck. Best ForBest for training, team sports, hot-weather workouts, and lightweight layering under jerseys or everyday outfits. Styling & VersatilityClean lines and a close-to-body silhouette make this an easy gym-to-daily staple. Reviewers like wearing it on its own for workouts and summer sessions or layered under uniforms, hoodies, and other tops when they want light, supportive coverage. Break-In & DurabilityMost reviewers say it feels comfortable right away and holds its shape well through regular workouts and repeat wear. Some note that the compressive collar and overall fit settle in after a few wears, reinforcing the secure feel. Care & MaintenanceTo help preserve stretch and compression over time, some longtime wearers prefer washing in cold water and hanging it to dry. Reviewers also note that the fabric continues to feel good after repeated washes."