It's worth keeping in mind there is a large difference between getting out of one's bag and vbl with one's long underwear slightly damp (but warm) versus being totally sweat soaked with perspiration running down one's body and a pool of sweat inside the vbl. Frequently in vbl discussions I think the later image is what is conveyed, but in my case the former image is what I've experienced. I'm not referring to vb clothing worn when active, but mainly just in a sleeping mode where one is not moving around. I'm 75% certain I like the vbl for sleeping, but have to make time to experiment with vb shirts.