This ultra-soft Merino wool beanie is the perfect winter running hat. This MerinoMIX PRO helmet hat is made of a blend of polyester and certified mulesing-free Merino wool to keep your head and ears comfortable while maintaining good breathability when you’re active, whether it be a more intense winter sport or going for a quick winter run in the morning. It’s also the best ski hat to wear under a helmet if you feel like hopping on the ski hill or going snowmobiling.