Under Armour is the first layer for all seasons and all ages, without cutting any corners on your kids' and teens' comfort. The Cold Gear line of clothing for children has become renowned for its ability to keep kids warm and dry with its advanced fabrics and fits. Under Armour creates and manufactures some of the most technically advanced first layer components on the market. Your kids and teens will be comfortable in the cold with junior Under Armour long underwear or mocks.