WHAT'S IT DO? UA athletes don't let extreme cold slow them down. They grab our Men’s UA Base™ 3.0 Longsleeve Crew for maximum warmth and minimal bulk. The thermal grid fabric is ultra-soft and traps heat like a beast. Its ultra-comfortable fit, raglan sleeves, and flatlock seams keep you totally mobile and chafe-free. As you heat up, the signature Moisture Transport System wicks sweat away from your body to keep you warm and dry. Don't let the cold stop you. Stop the cold.