The best men’s merino wool base layer should be very comfortable and lightweight because it comes into direct contact with your skin. As their name suggests, base layers are designed to keep you warm in cold weather. Ideally, the ones made of merino wool work great because merino has lots of benefits such as odor-resistant and anti-bacterial properties.Merino wool is also breathable to ensure that you are able to wear these base layers even during summer. Plus it is lightweight to make sure you are not inconvenienced in any way during such outdoor activities as ice fishing, hunting, snowboarding, skiing, and more.