Under Armour type fabric-LONG SLEEVE MOCK NECK

It's not the Under Armour brand but offers all the features. This has more of a tight fit, next to skin but without the squeeze. Fabric is ultra-soft with a natural feel, comfortable yet maintains warmth. Material wicks sweat and dries really fast. 93% nylon, 7% spandex. In perfect condition, only worn/washed a few times.