I'm looking for thoughts, suggestions, based on experience for a good base layer. I'm going NOBO no later than March 1st 2020 and I have all my equipment except the base layer. My clothes are a mixed bag, Smartwool socks, Columbia pants, The North Face rain coat, basically whatever I liked at the time that was wool or synthetic. Some of my choices were based on sale prices but I do want to be warm so I'm not going to just throw something in the cart for the base layer. I'm looking at Underarmour but I'm wondering if anyone has thoughts about synthetic vs wool or has had good experiences with a particular brand of long underwear?