Helly Hansen's professional grade kids base layer uses a soft and unique 2-layer Lifa® fiber technology to keep kids dry and warm while outdoors. This high performance base layer combines the unique Lifa® fiber technology next to skin to stay dry, with a premium non-itchy 100% Merino wool exterior with superior insulating and wicking properties. Features fleece patches at the elbows and knees. Kids Base Layer: 57% merino wool, 43% polypropylene, machine wash.