Mons Royale Women's Olympus 3.0 Half Zip - Merino wool Designed for the coldest days and the biggest adventures, Olympus is our warmest baselayer offering unrivalled warmth to weight ratio and strategically placed mesh panels to ensure breathability. We use midweight 250 merino wool with added elastane so that Olympus will keep its shape and last longer. Features 250 Midweight Merino is our warmest baselayer weight for the coldest conditions Mons slim fit Raglan sleeves for ease of movement Merino mesh underarm panels Half zip for ventilation Thumb loops. Materials: 97% merino wool 3% elastane Weight:  250gsm What's sustainable? ZQ Certificate   Non-mulesing Merino wool ZQ is a hallmark that certifies a farmer is meeting the highest standards in the areas of animal welfare, environmental care, and social sustainability - e.g. traceable, No mulesing, Hand selected Environmentally friendly dyes and water processing & fair manufacturing process