100% extrafine merino wool - 18.5 micron, 190gsm A versatile layer designed for toddlers, kids, and school-age children, our Merino Singlet is the ideal base layer. A generous length for tucking in to keep the back warm. Perfect for colder months and can also be worn on its own in warmer weather. Pair it with our Long Sleeve Tee for additional warmth, or layer it under any other day or nightwear.