Description The laws of thermodynamics dictate that heat will always move to colder areas. Well, not anymore. With the Thermic LS long sleeve base layer, we’re fighting physics with physics. Engineered with hypoallergenic Dryarn® fabric in very specific, strategically placed knitting patterns, our R&D managed to create a long sleeve base layer shirt that actively insulates body heat. Meanwhile perspiration is wicked away, absorbed by the fabric, and allowed to evaporate away from the skin, preventing the moisture from conducting between the cold outside and the heat inside. Even the raised elasticated collar is designed so the base layer comfortably wraps around the neck, preventing rising heat from leaving your core. Much more than just underwear By effectively trapping body heat, your body is less strained to keep your body temperature up by burning calories and consuming energy. Energy you could be putting to good use to stay sharp and focused, proving the Thermic LS base layer shirt is much more than just simple underwear.