Under Armour Men's Coldgear Base 2.0 Crew Black UA Base is a system of baselayers, numbered from 2.0 to 4.0, that takes you from cold to absolutely freezing temps. It's constructed using a special negative grid pattern with each individual cell designed to trap heat without adding bulk. Think long underwear, re-engineered for athletes performing at their peak. UA Base 2.0 is built for cold weather and higher activity levels. Product DNA Fitted: Next-to-skin without the squeeze. UA Base™ 2.0 is highly versatile mid-weight protection for colder conditions & a variety of activity levels Soft, brushed negative grid interior traps hot air, providing superior warmth 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes 95% Polyester/5% Elastane Imported Under Armour Men's Coldgear Base 2.0 Crew Black