Under Armour 2.0 Base Crew - Women's: Fitted: Next-to-skin without the squeeze. UA Base(TM) 2.0: Versatile mid-weight layering for cold conditions Thermal grid fabric traps heat in tiny pockets for long-lasting protection Quick-dry construction wicks moisture to keep you drier, lighter, and more comfortable Lightweight, 4-way stretch construction improves mobility and maintains shape Anti-microbial technology fights odors to keep your gear fresher, longer Raglan sleeves and flatlock seams unlock mobility and eliminate chafing Thumbholes keep sleeves secure and help seal in your body heat Polyester/Elastane