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

Built for men who train and compete hard in the heat, the Under Armour HeatGear® Compression Mock Long Sleeve is the ultimate hot-weather base layer. Ultra-lightweight HeatGear® fabric delivers full arm and neck coverage that breathes instead of baking — keeping you cool no matter how intense the session gets. Wear it as a standalone training top or layer it seamlessly under pads or a jersey. Designed for hot-weather performance, not cold-weather warmth.

• Tough, lightweight HeatGear® fabric provides all the performance benefits of UA Compression in a breathable, second-skin construction.
• Stretch-mesh back and side panels deliver strategic ventilation exactly where you need it most.
• Moisture-wicking material pulls sweat away from your skin and dries extremely fast to keep you comfortable.
• Mock neck construction adds extra coverage at the neck for protection during contact-sport training.
• Updated ergonomic seam design keeps seams away from high-abrasion areas, boosting long-term durability.
• Ultra-tight, second-skin compression fit squeezes muscles to help you feel powerful and supported throughout your workout.

HeatGear® Fabric Technology

The proprietary HeatGear® fabric is engineered to be as light and breathable as possible while maintaining the powerful compression fit UA is known for. It regulates your body temperature in hot conditions, making it ideal for warm-weather training sessions on and off the course.

Strategic Ventilation & Ergonomic Construction

Stretch-mesh panels on the back and sides create targeted airflow zones where heat accumulates most. The updated ergonomic seam placement reduces friction against the skin during high-intensity movement, extending the garment's lifespan and your comfort.

Compression Fit Explained

This garment features an ultra-tight, second-skin compression fit that wraps your muscles firmly, helping you feel more powerful and supported. It sits closest to the body of all UA fit types, making it the go-to choice for layering under pads or a golf jersey.

Mock Neck Coverage

The mock neck collar provides additional sun and abrasion protection at the neckline — a thoughtful feature for outdoor athletes spending long hours in the sun. It pairs perfectly with a golf polo or performance outerwear without adding bulk.