The best children's underwear on the market uses a clever 2-layer construction to keep young active ones dry and warm. Our LIFA® technology wicks moisture away while the soft merino wool creates breathable warmth. We've improved it with cool prints because basics can be fun too. This set features a regular fit, elastic waistband, flat seams for added comfort, and a graphic print on non-irritating fabric. Shell: 57% merino wool, 43% polypropylene. Machine wash warm, do not bleach, do not tumble dry, do not iron, do not dry clean, do not use fabric softener, do not twist, use wool detergent, wash inside out.