Here's what other sites are saying:
WHY WE MADE IT: UA BaseA(R) is a total overhaul of sweat-soaked, old-school long underwear. We improved its traditional waffle pattern-and supercharged it. The result is our sweat-wicking baselayer line-up that steps up the heat as the outside temps drop. UA BaseA(R) 1.0 is light, early season cold protection for high activity levels. Our most versatile baselayer, UA BaseA(R) 2.0 puts a lot more cold-weather days in play. Choose UA BaseA(R) 3.0 when it gets really cold and you need to trap every last bit of your own heat. For times when you question the sanity of even being outdoors, UA BaseA(R) 4.0 is going to keep you warm-period. When the rest of the world's inside, we know what drives athletes out into the cold. We've got your back. Made for those days when you're really gonna turn it up, the ColdGearA(R) UA BaseA(R) 1.0 Crew's thermal grid fabric regulates your core temp and allows for maximum moisture transport with minimal bulk. So whether you're on a run or on the mountain, the men's ColdGearA(R) UA BaseA(R) 1.0 Crew is your first line of defense against the cold. Ultra-lightweight UA BaseA(R) 1.0 construction provides cold protection for higher activity levels or milder weatherSmooth exterior makes layering easy and the ultra-soft internal grid traps heat for warmth without the weight4-way stretch fabrication improves range of motion, dries faster and maintains shapeSignature Moisture Transport System keeps you warm, dry, and comfortableAnti-odor technology prevents the growth of odor-causing microbes to keep your crew fresher, longerRaglan sleeves and flatlock seams prevent chafing2.7 oz. PolyesterImported
- Under Armour refers to the men's version
Pull on the Under Armour Men's fitted Base 1.0 Crew Long Underwear Top for early spring runs. Under Armour's thermal grid fabric looks sort-of like a computer keyboardthe grid-channel troughs trap air and cut down on the amount of yarn, so the Base 1.0 feels light, wicks, and dries quickly. This long-sleeve top also neutralizes odor-causing microbes, so you won't smell like a sweaty horse after your training run.
- Backcountry.com refers to the men's version
Built with Under Armour's Lightweight ColdGear(R), the Under Armour UA Base 1.0 Crew for Men is ideal for training when the temperatures are under 55degF and the exertion levels are high. Moisture wicking and quick to dry, the Base 1.0 Crew has flat lock seams for all-day chafe-free comfort and ArmourBlock(R)Technology, reducing odor and keeping you feeling fresh throughout the day.
- Altrec Outdoors refers to the men's version