ColdPruf Youth Quest Performance Base Layer Long Sleeve Shirt - This baselayer is rated for cold to very cold weather with high activity levels. It Controls odor and inhibits bacterial growth on fabric as well as wicks and aids in moisture evaporation. The inside is brushed for warmth and comfort. Single Layer Engineering ColdPruf Technical Fiber Polyester with SILVADUR Intelligent Freshness 85% Microfiber Polyetser 15% Spandex Fabric Weight: 184g Drop Shoulder Design Self Fabric Cuffs Tagless, Flat Seams offer added comfort Style: 62A