"I feel like I'm naked when I'm wearing it" was one of the more memorable pieces of feedback Kelsey Greenwell heard from a Maryland Terrapins quarterback testing Under Armour's new ARMR 037 uniform.

KNOW YOUR TECH breaks down the scientific technology used in your favorite sneakers and activewear. Let’s demystify your next purchase: today’s technology is Under Armour HeatGear. UA HeatGear is a ...