Mons Royale Women's Olympus Half ZipUltimate warmth. Designed for the coldest days and the biggest adventure. Olympus is our warmest base layer 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. Fit: Slim Features: Half zip for ventilation Raglan sleeves for easy movement Merino mesh underarm panels Flatlocked seams to prevent