I have some and still wear it but it is very hard to find now.
I have wool net by Devold from Norway that is super. Poly net from 20+ years ago that somehow is real tight to wear now
and cotton/poly sting from about the same time frame.
Wiggy's still list some but I have never tried them. This is the only place I could find and searching the web with "mesh underwear" can lead to some very interesting places.....This guy seemed to not show up there :shock:
http://www.wiggys.com/category.cfm?Category=2&StartRow=5
I would snap up any of the Devold wool net that I could find. My all poly stuff is very old and is very abrasive to wear, but works great in the summer for ventilation particularily under a pack. The cotton/poly stuff is actually good even though it is cotton it does not get the damp clammies that reg johns do.
I consider string underwear to be superior in many respects to all the new tech stuff, but I recently acquired a SmartWool top that is heaven. Very soft merino wool with non-binding sleeves and just about perfect weight.