'The Under Armour HeatGear OG Compression Long Sleeve is a silhouette you'd love to put on first and take off last. Crafted with four-way stretch fabrics, this sweat-wicking, long-sleeved T-shirt brings superior comfort, coverage, and unrestricted movement. The ultra-tight fit with optimum muscle compression offers a body-hugging feel and improved performance. Rounded off with ergonomic flatlock seams for a chafe-free fit, the Under Armour Heatgear OG Compression Long Sleeve helps you achieve new personal bests. From early training sessions to game-day layering, this compression top is built to keep you dry, supported, and comfortable without slowing you down. The Under Armour HeatGear OG Compression Long Sleeve delivers a smooth, second-skin feel with sweat-wicking performance, four-way stretch, and flatlock seams that help you move freely through workouts, runs, and everyday training. Size & Fit Guidance For the best fit, most reviewers recommend choosing your usual size if you want a true compression feel. If you prefer a little more room for layering or a less intense hold, some shoppers recommend going up one size. Best For Best for training, running, team sports, and wearing as a dependable base layer in cool conditions. Styling & Versatility Reviewers like how easily this top works under jerseys, hoodies, and T-shirts while still looking sharp on its own. The clean, athletic design makes it a go-to piece for workouts, outdoor activity, and everyday performance layering. Break-In & Durability The compressive feel is ready from the start, and many reviewers say the fabric stays comfortable, holds its shape, and continues performing well through repeated wear and washes. Care & Maintenance Many shoppers note that routine washing helps this top maintain its fit, feel, and overall look over time."