Under Armour 2.0 Base Crew - Youth: Fitted: A slimmer, more athletic cut. UA Base(TM) 2.0 is highly versatile mid-weight protection for colder conditions and a variety of activity levels Soft, brushed negative grid interior traps hot air, providing superior warmth 4-Way Stretch fabrication allows greater mobility and maintains shape Signature Moisture Transport System wicks sweat away from the body Quick-dry fabrication keeps you light and comfortable Anti-Odor technology prevents the growth of odor causing microbes Raglan sleeve construction and flatlock stitching allow a full range of motion without chafing Polyester/Elastane