Children's leggings: The Devold DUO ACTIVE MERINO LONGS JR are made of an advanced two-layer knitted fabric with excellent functional properties. They have a unique two-layer construction. Two types of knit fabric with different properties are attached together. The bottom layer is made of ThermoLite fibre which is very soft and sweat wicking. The Merino wool top layer is insulating, absorbent, and sweat wicking. This ensures that your child has a constant feeling of dryness and warmth.