LG Base - Multifunction
I bought the base layer for the heat - the extra wicking moves the sweat away quickly and you remain amazingly dry. We have plenty of humidity here in Northeast Ohio and the LG top works well for me. Runs true to size - I am a 44" chest and the XL is snug (which is how you want it). I wore it in the wee hours this morning at about 50F and it also works for some warmth. For the price, this top seems like a great deal.