Helly Hansen Graphic Lifa Merino Baselayer Set Kids' Kids Helly Hansen Graphic Lifa Merino Baselayer Set Kids' Kids Boys Baselayer Helly Hansen Jr Lifa Merino Bright Green Splash Camo Kids' Lifa Merino Wool Base Layer Set Helly Hansen Canada Helly Hansen Graphic Lifa Merino Baselayer Set Kids' Kids. 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.