Under Armour UA Qualifier Iso-Chill Run Black/Reflective S Running t-shirt with short sleeves

Iso-Chill technology feels cool the instant you put it on. Like an ice pack built right in, its ribbon-shaped nylon fibers disperse heat, while titanium dioxide—the stuff in sunscreen—pulls away heat. You feel cooler, so you can play longer. 

• Iso-Chill mesh fabric helps disperse body heat, making it feel cool to the touch
• 4-way stretch construction moves better in every direction
• Material wicks sweat & dries really fast
• Reflective details for low-light runs