I had several Jantzen shirts made when I was in HK. Mostly they are more substantial fabrics, but two, in particular, are lightweight. I don't believe the fabrics are marked on the shirts, and as such I'm not sure I can give you exact numbers. If I can ID them, I will. I believe at least one was an End-on-End 120s two ply, still quite light, Italian fabric. I'd check those out.