The kids' Polarmax Active Stretch Base Layer Crewneck is a baselayer top for skiing, adding flexible warmth beneath outer layers on cold days. Four-way stretch and a polyester-spandex blend support unrestricted movement on the slopes, while balanced insulation helps keep kids comfortable in the cold. Acclimate Dry technology helps regulate temperature, and activated carbon supports odor and moisture management. A Bio Silver treatment helps reduce odor-causing bacteria.