100% extrafine merino wool - 18.5 micron, 190gsm A versatile layer designed for toddlers, kids, and school-age children, our Merino Long Sleeve Tee offers both warmth and comfort without compromising on breathability. Thoughtfully designed with a generous length for tucking in to keep the back warm. A temperature-regulating layer, creating a snug and breathable barrier for indoor and outdoor activities. Pair it with our Singlet for additional warmth, or layer it under any other day or nightwear.