The Helly Hansen Jr Lifa Baselayer Set uses a two-layer build to handle both sides of a cold, active day. LIFA(R) technology wicks sweat away from the skin while soft Merino wool adds breathable warmth on top, so a kid stays comfortable whether they're standing still on a lift or working hard on the way down. Flatlock seams keep the fit smooth against the skin, and the wool itself comes from ZQ-certified sources for a base layer built to hold up through repeat wear. What Our Gearhead(R) Experts Are Saying:"My kid wore this under their ski layers for a full day on the mountain and never complained about being cold or clammy once."