What is under Armour infrared? ColdGear Infrared® technology holds in body heat, without adding weight or bulk. It's a special, soft print on the inside and it keeps you warmer, longer, so you can work out in the bitter cold. Elevate your winter workout wardrobe with this stylish and functional piece from Under Armour. Whether you’re training outdoors or staying active, this mock neck top ensures warmth, comfort, and freedom of movement. Condition: Excellent pre-owned, no flaws. ✅ From a pet free/smoke free home ✅ Reasonable offers welcome ✅ I ship same day or next if weekend