I've got a 221B.
ninety fucking dollars worth.
Prior to this, I had the mesh shirt, and before that, I think a ribbed shirt.
None of that shit works for me.
Strangely enough, I don't like compression shirts. I'm still wearing neanderthal cotton. Can't explain it.
Far as the 221B, I haven't worn it enough to give it a true thumbs down. It's like an air conditioning filter, and I am betting it has its roots in some kinda football undergarment or similar.
Thing is, there is no vertical venting. All it does is keep the vest layer from laying directly on the undershirt layer. So I find myself still farting and flapping the vest to get some airflow in there. And, fat as I am, I just can't take it, too fucking hot with the humidity getting past 60%.
I'm building myself an external carrier that looks like the polo I have to wear. At least I'll be able to crack a side panel that way.
Oh - I'm also wearing a new vest, with some kinda coolmax-type inner carrier layer. It doesn't help either.