Material composition 57% Merino Wool, 43% Polypropylene Care instructions Machine Wash Country of origin China About this item Our warmest juniors’ base layer set, combining unique Lifa wicking technology with merino’s natural breathable warmth. Description The best kids’ base layer on the market uses a clever 2-layer construction to keep active youth dry and warm. Our Lifa® technology wicks away moisture while soft merino wool creates breathable warmth.