Poly Pro base (No matter what brand) is the foundation because it wicks moisture to your outer layer... Acrylic , Acrylic / Wool blend ,& Wool - are the others that wick moisture & also Insulate while wet... Polyester I believe wicks moisture but does poorly for insulating ... When it comes down to it ,, I have been taught this -- Cotton Kills ........... You can save money buy buying Poly Pros from anywhere that sell winter clothing... Walmart sells it .... For 1/3 the cost
I'd make fun of Isaiah wearing his buddy's undergarments... but he's a big dude and would probably hurt me. :D