Under Armour HeatGear Comp Mock men's compression long sleeve t-shirt, black/white

The Under Armour HeatGear® Compression Mock Long Sleeve is the ultimate hot-weather baselayer for men who demand peak performance. Built with ultra-lightweight HeatGear® fabric, it keeps you cool, dry, and distraction-free whether you're wearing it as a standalone training top or layering it beneath pads or a jersey. The ultra-tight compression fit supports your muscles like a second skin, while the mock neck adds full coverage exactly where you need it. Engineered for high-intensity hot-weather training, this long sleeve breathes — it never bakes.

• Tough, lightweight HeatGear® fabric delivers all the performance benefits of UA Compression for a second-skin fit that moves with you.
• Stretch-mesh panels on the back and sides provide strategic ventilation, releasing built-up heat during intense activity.
• Advanced moisture-wicking technology pulls sweat away from the skin and dries extremely fast to keep you cool and comfortable.
• Updated ergonomic seam placement keeps stitching off high-abrasion zones, significantly boosting long-term durability.
• Mock neck construction sits flat under a helmet collar or jersey, delivering added coverage without bulk.
• Compression fit locks muscles in place and layers cleanly under pads without bunching or riding up.
• Full-arm flatlock seams prevent chafing and turf-burn abrasion across the entire sleeve for all-day comfort.

HeatGear® Fabric Technology

Under Armour's iconic HeatGear® fabric is engineered specifically for hot conditions. The super-light, 79% polyester / 21% elastane blend wicks moisture away from your skin rapidly and dries in record time, so your body stays cooler and your focus stays sharper throughout the most demanding sessions.

Strategic Ventilation Mesh Panels

Stretch-mesh inserts on the back and side panels are precisely positioned to release built-up heat exactly where you generate the most. The result is a baselayer that actively breathes with you, preventing overheating during high-intensity contact sport training or long rounds on the course.

Mock Neck Construction

The mock neck collar is purpose-built to lie flat under a helmet collar or jersey without creating pressure points or extra bulk. It adds meaningful neck and upper-chest coverage, making this shirt ideal not only as a baselayer under pads but also as a standalone athletic top during outdoor training.

UA Compression Fit

The compression cut delivers an ultra-tight, second-skin fit designed to support muscles during movement and layer seamlessly beneath other gear. Unlike a tight or fitted cut, the compression profile adds targeted muscle support and stays locked in place even during the most explosive athletic movements.