The original 100 merino wool leggings the fabric insulates during frigid days on the trail or the ski hill and it breathes efficiently on runs hikes and summer trips into the mountains icebreaker also designed the oasis with a gusseted construction and flatlock seams for chafe free unrestricted movement why icebreaker merinothe merino is an ancient breed of alpine sheep over millions of years they evolved a superfine highly breathable fleece to protect them from freezing winters and sco