ColdPruf Youth Enthusiast Single Layer Bottom 100% Polypropylene Imported Thermal underwear bottom, not intended as a compression or athletic pant. Lightweight single layer with exceptionally soft feel. Pant sits at natural waistline Tagless labeling, non-itch waistband and gussets for added durability and comfortable fit Moisture management system wicks perspiration and dries quickly These long john bottoms are best used as a base layer under your child's clothing in cold to very cold weather and medium to high activity levels