jgl, I bought them after speaking to a friend of a friend when I was down under. He said he used them trekking in the jungles of Malaysia and swore by them. He particularly liked that they don't smell, saying he wore one t-shirt for three weeks!
Kind of reminds me of my surprise when I looked into cycling deaths for the last year before I did the ride of silence.....I was expecting loads of car accidents but nearly all were crashes or suspected heart attacks....Many might have stood a chance if they were with other peeps.
One thing I DON'T recommend is tennis at midday. Thought I was going to die.
Keeping Cool in HKG - 2012 edition, with updates!
If you want to keep cool and smelling fine, you need 3 things (unisex):
1. underwear from uniqlo UNIQLO AIRism, these have been updated, there is now a 'mesh' version which is great. I will also check out Adidas ClimaCool Vest ..
2. deodorant - skip the lynx, buy something fragrance free and natural (not to mention cheap). You can check out the natural 'crystal' type of rub on products, very good for keeping the bacteria(smell) away.
3. for ultimate dryness - get your hands on some Snake Brand Prickly Heat Cooling Powder (developed for colonialists in South East Asia) - Amazon.com: Snake Brand Prickly Heat Cooling Powder Ocean Fresh 150g: Beauty - available at Fanda. Put some of this on your skin and you'll feel cool for a few hours.
I was in New Zealand earlier this week and nearly fainted at Icebreaker's prices. I know they were never cheap but they seemed to be eye wateringly high, much higher than I paid in the UK (unless I have a very bad memory - which is entirely possible!)
Herbal tea (you can get them in bottles from supermarkets & convenience stores if you're unsure of the specialist shops). Will not give you any immediate relief but will rebalance your body over time.