Our Kids&'; Classic Thermal Merino Base Layer Crew is made of 100% responsibly sourced Merino wool to help your little ones stay comfortable on snow days and activities in the mountains. With a flatlock seam construction designed to help prevent chafing, a crew neck built with set-in long sleeves, and all of the benefits of Merino, this kids&'; base layer will help them enjoy winter more. Features "Knit in Vietnam: 100% Merino Wool Flatlock seam construction designed to minimize chafing Crew neck with set-in long sleeves 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance Slim Fit" SW0SN110 Care Machine Wash Warm Gentle Cycle. Dry Clean. Cool Iron As Needed Tumble Dry Low Do Not Bleach