The Women s Merino Fusion Leggings from Trekmates are made using ultra soft lightweight merino wool for excellent next to skin comfort & warmth Merino wool is naturally odour free & adjusts to suit the climate meaning you stay warm when it s cold & cool when the temperature rises Merino wool stays warm when wet & is highly breathable & with flatlock stitched seams the Fusion Baselayer will not rub or cause discomfort