Is it possible to look lightly dressed and still be warm on the inside? Well, that depends on the technology you use. Most crewneck long-sleeve shirts that look like this won't keep you warm.

The Under Armour Men's Black ColdGear Infrared Crew is different. It features the aforementioned ColdGear Infrared technology, which gives you a thermos-conductive coating that helps you retain more body heat. It's great for a layer underneath your clothes in very cold temperatures and works just as well as a feature piece in cool temperatures. Add your custom logo to this infrared crew and you can put your name on top of a high-tech shirt.