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The IceBreaker Tech Long Sleeve Half-Zip is a winter sports MVP. Built from our highly insulating 260gm merino fabric, it keeps your body warm but remains breathable and amazingly soft when worn as a baselayer, or alone on long hikes in the high mountains. With set in sleeves, forward side seams and offset shoulder seams, it won't chaffe when you work out or under a pack, and the drop tail hem provides a little extra coverage against chilly air. If you really start to heat up, the half zip provides instant cooling. And merino's natural odor resistance makes it the perfect jersey for multi day adventures.
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.