'Combat the heat with stylish, breathable performance. Hot workouts, game-day layers, and long training sessions call for a top that stays close without slowing you down. The Under Armour HeatGear Armour Compression S/L Shirt delivers a streamlined, supportive feel with lightweight breathability, making it a go-to for training, practice, and everyday athletic layering. Size & Fit GuidanceFor the best fit, we recommend choosing your usual size if you want the intended close, compressive feel. If you prefer easier on-and-off or a slightly less locked-in fit, some reviewers suggest sizing up. Best ForBest for training, team sports, and wearing under jerseys or uniforms when you want light support, sweat-wicking comfort, and a smooth athletic layer. Styling & VersatilityThe sleeveless design layers cleanly under jerseys, pads, and work shirts without extra bulk. Reviewers also like it on its own for gym sessions, running, and everyday active wear thanks to its sleek, body-contouring look. Break-In & DurabilityMost reviewers say it feels comfortable right away and moves well once on, with fabric that holds its shape through repeated wear. Many also note long-lasting performance for regular workouts, practices, and daily use. Care & MaintenanceReviewers say this shirt washes well, keeps its fit, and continues to look fresh after repeated laundering, making it an easy addition to a steady training rotation."