icebreaker has the world’s best merino wool layering system. Our women’s thermal base layers are made with superfine merino wool, sourced from our growers in New Zealand. Merino wool clothing is naturally breathable and wicks moisture from your skin, so you can stay feeling comfortable all day. Wear our women's merino base layers as thermal tops and leggings for warmth in even the most extreme cold, or under your winter clothes for cosy comfort. Merino regulates your body temperature in both heat and cold, and is naturally odour-resistant, so you can stay smelling fresh for longer. Layer with our women's tops and trousers for cool-weather outdoor adventures or training.