TCA Men's & Boy's SuperThermal Compression Base Layer Thermal Under Layer Superthermal soft brushed inner fabric locks in heat for exceptional warmth Moisture wicking fabric is QuickDry and absorbs sweat from the skin keeping you dry and comfortable Breathable 3DAirMesh panels provide strategic ventilation in high heat zones TCA compression fit improves muscle power and endurance Flat lock seams eliminate chafing with four way stretch allowing full range of motion