Under Armour Base 4.0 Crew Top - Men's Black Medium. Which is why the UA Base 4.0 Extreme is our warmest and best base layer yet trapping your body's heat to deliver extreme warmth in the extreme cold. Featuring UA Scent Control Technology to keep you undetected in all pursuits and a soft brushed grid interior that traps air against your skin managing your body's microclimate to keep you warm and comfortable. Material wicks sweat & dries really fast 4-way stretch construction moves better in every direction Under Armour Base 4.0 Extreme is our warmest yet locking in your body's heat to deliver extreme warmth in the extreme cold. Specifications for Under Armour Base 4.0 Crew Tops - Men's: Manufacturer: Under Armour Sleeve Length: Long Sleeve Age Group: Adults Apparel Fit: Next To Skin Gender: Male Color: Black Application: Cold Weather Shirt Style: Base Top Fabric/Material: 78percent Polyester/22percent Elasterell Features of Under Armour Base 4.0 Crew Tops - Men's Fitted: Next-to-skin without the squeeze UA Base 4.0 Extreme Baselayer is our warmest yet locking in your body's heat to deliver extreme warmth in the extreme cold UA Scent Control Technology to keep you undetected in all pursuits Soft brushed grid interior traps air against your skin closely managing your body's microclimate to keep you warm & comfortable Material wicks sweat & dries really fast 4-way stretch construction moves better in every direction Package Contents: Under Armour Base 4.0 Crew Tops - Men's Under Armour 1353349001MD: Base 4.0 Crew Top - Men's Black Medium