cold weather

Thin base layer such as 32° Heat, UnderArmor or other lightweight layer to start with other layers over the top. Layering with thin layers is better than one thick layer as layers can be removed to adjust for activity so one stays dry and does not get the layers wet with sweat. Fleece is a good option, but not as a base layer. Now if one is experiencing sub-freezing temperatures, then a thicker fleece base layer can be quite good, but one does have to be careful to adjust layers to avoid sweating. I spent many cold days outdoors on field exercises while I was serving in the U.S. Army. Both Germany and South Korea can get pretty cold.