The junior thermal set combines unique Lifa® moisture wicking technology with the natural breathable warmth of merino. The best kids' base layer on the market uses a smart 2-layer construction to keep active youngsters dry and warm. Lifa® technology wicks away moisture while soft merino wool creates breathable warmth. Features: -Highly breathable - The breathability range is the Helly Tech Performance range. 10000 to ≪ 20000gsm/day 2-layer construction -Fabric weight 215gsm Composition: 57% merino wool / 43% polypropylene