We gave the base layer an upgrade with performance fabric and a slimmer fit. Our VentTEK™ Underscrub features built-in breathability for extra warmth without overheating. VentTEK Underscrub Baselayer Product Features : 0 : Silver-based FreshTEK+™ sustainable odor resistanceVentTEK™ technology enables airflowClimateTEK™ for dynamic and temperature regulated coolingStain repellentMoisture Movement Technology™ wicks away moisture from skinGreater Arm Mobility™ for freedom of movementDuraStretch™ fabric for durable flex, 1 : Breathable mesh insets at sides, back and under arms, 2 : Convenient locker loop, 3 : This product contains materials that meet the bluesign® sustainability standards Women's VentTEK Underscrub Baselayer in Winetasting, Size: XL by Ariat