Made from 100% Australia Merino wool, the Merino Crew Neck is 230gsm winter weight base layer. This means it is naturally temperature regulating; keeping you warm in cold climates and cool in warm climates. It's odour repellent extremely breathable Silverky smooth and non-itch. Designed for all types of exercise from general leisure to hiking, climbing,running ,rowing and snow sports.Try them and see what you can add to the list they'll soon become your second skin.