These mens leggings are primed for any cool weather outdoor adventure and when we say cool we mean happily slogging across a glaciered terrain in sub zero temps 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 nature and engineered for people