Helly Hansen's professional grade kids base layer uses a soft and unique 2-layer Lifa® fiber technology to keep kids dry and warm. These base layers do the trick on the mountain, on the trail or on the water. 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 (non-itchy), 43% polypropylene, machine wash.