Under Armour Men's HeatGear 6'' Boxerjock 2 Pack Polyester/Elastane Imported Polyester and Elastane Fabric Blend - Allows the garment to adhere to the contours of the wearer's leg without impeding movement or comfort. 4-way Stretch Fabrication - Accommodates extended mobility and maintains shape. Moisture Transport System - Wicks moisture away from the skin and onto the fabric's external surface. HeatGear Fabric - Regulate the wearer's temperature and moisture output superbly, thereby promoting a cooler, drier and altogether more comfortable environment. Antimicrobial Fabrics - Inhibit the spread of bacteria and unwanted odours.