THERM-IC Ultra Warm Heated Baselayer S.E.T® Top Men"The Ultra Warm Base layer S. E. T is the must have first warming layer when you're embarking on outdoor adventures. This heated technical underwear gives you optimum protection from the elements and ingeniously combines Smart Elastic technology with thermo regulating knitted features to create the perfect body micro climate, while avoiding the need for an extra layer, allowing you total freedom of movement. Equipped with the slim and elastic S. E. T