Step up your workout game with the Under Armour HG Armour Comp Mock Long Sleeve. This baselayer is your ultimate workout essential, designed to be the first thing you put on and the last thing you take off. Crafted from innovative HeatGear fabric, this top ensures superior comfort by quickly wicking away sweat. The tough yet lightweight material delivers all the benefits of UA Compression, giving you a snug, second skin-like fit that moves with your body effortlessly. The ergonomic design keeps seams away from high-abrasion areas, enhancing both durability and comfort. Achieve your best with the Under Armour HG Armour Comp Mock Long Sleeve. Cool starts, hard sessions, and long days under a uniform call for a layer that stays light and works overtime. The Under Armour HG Armour Comp Mock Long Sleeve delivers a supportive, second-skin feel with sweat-wicking HeatGear fabric, making it a go-to for training, practice, and everyday layering in cool-to-mild conditions. Stretch-mesh ventilation helps keep air moving, while the mock neck adds a little extra coverage without bulk. Size & Fit Guidance Reviewers most often describe the fit as true to size for a compression top, with a snug, supportive feel that moves well without feeling restrictive. For the best fit, we recommend choosing your usual size if you want that locked-in compression feel; if you prefer a little less hold or are between sizes, some shoppers prefer sizing up. Best For Best for training, cool-weather workouts, and layering under uniforms or outerwear when you want lightweight coverage without extra bulk. Styling & Versatility This is the kind of performance essential that earns repeat wear. Reviewers call out how easily it layers under jerseys, polos, work shirts, and cold-weather gear, while the streamlined mock-neck silhouette also looks clean enough to wear on its own. Break-In & Durability There is little to no break-in feel here. Customers say it is comfortable from the start, holds its shape well through repeated wear, and continues to perform as a dependable base layer over time. Care & Maintenance Reviewers note that the fabric keeps its fit well after multiple washes. To keep it feeling fresh for frequent training or all-day wear, wash promptly after use and follow the care label for best long-term performance.