Hi,
I'm going to spend a couple of months travelling around SE Asia, with some trekking mixed in — both jungle and mountain, probably Fansipan in Vietnam (10,312 ft). I'll be hostelling the whole time. For convenience, any overnight trek I do will be with a company, so that I don't have to carry gear I wouldn't be using for most of my trip (besides, hiring a guide is actually mandatory in some places).
Thus, my question concerns mostly what to wear.
I'll be travelling at the end of the "cool" season, but I may catch a bit of the hot season, depending on where I am. (February/March)
TOPS: I have been looking around a bit and some people seem to favour cotton or poly/cotton blends instead of synthetic shirts. is that right? Which manufacturers and models should I be looking into?
Mosquitos can be a problem, and I've heard you should wear long sleeved shirts around dusk. Again, which would be a good option?
WARM LAYERS: I've been hesitating here. I've travelled in Japan during summer (caught quite a bit of the rainy season) and the most I ever wore, on the mountains, was a combo of base layer + powerstretch midlayer + lightweight rain jacket.
Dunno if the same would apply to SE Asia?
I've heard that it's advisable to take some lightweight fleece jacket or something like that even for the cities because air con in public spaces can be arctic chilly.
I could take a MontBell Ex Light down jacket as well, just to be safe, as it's light and compressible enough. Thoughts?
WINDSHIRT or RAIN JACKET: Don't know what would be the best option here. Probably will take one of those small, UL umbrellas with me, as it can provide some sun shade.
SHOES: I was thinking of taking a pair of trail shoes and a pair of sandals (this is not an UL hiking trip ;)). I usually wear Salomon shoes. I've seen people making points against GTX shoes, would it be better to take some trail runners? (regular running shoes don't do it for me).
SOCKS: Which kind would you recommend for hot & humid climates? I'll probably want to take a couple of pairs of ankle socks and a pair of midweight, mid-calf ones.
WATER PURIFICATION: I'd like to avoid buying bottled water all the time. I was thinking of acquiring a SteriPen (which model, though?) and taking that along with spare batteries and Micropur tablets as a backup. Should that be good enough?
As always, thanks in advance for any input!

