ColdPruf doesn't sacrifice anything when it comes to their children’s base layers. The Cold Proof Basic Base Layer for children is made with the same materials and to the same specifications as the adult basic base layer. For those cold days when your kids won’t be too active, there's the ColdPruf Basic Base Layer. The Basic base layer outfit for kids is made with a 60/40 combination of ring spun cotton for a comfortable, next-to-skin fit all day and polyester that wicks moisture away from their skin, keeping them warm and dry. The Basic base layer is sewn with flat seams and has no tags so they won’t complain about itchiness and bumps.