Great as a baselayer comfortable as a casual tight under a long jersey and breathable on cool weather runs or hikes everyday leggings can be worn day after day no matter what activity awaits why icebreaker merino the 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 scorching summers it will do the same for you what is merino wool merino wool is a performance fibre invented by n