Detroit Lions Men’s HyperWarm Dri-FIT Mock Neck by Nike. This blue mock neck shirt features a heat transferred Lions logo on the collar and the NFL shield center back. This is part of Nike’s HyperWarm series. It is insulated with fleece and traps in heat. It is also made using Nike’s Dri-FIT technology, pulls the sweat away to keep you dry and comfortable. It is a slimmer cut, it should hug your body to do it’s job. 100% Polyester.