Many women in HK suffer from this particular issue.  We welcome your input and questions on this subject

Is there a good product or conditioner that can minimize frizzy hair? Is it just the humidity, or is it also the water that messes up people's hair?

Charlie,
  great question!  Well, there are several factors that can effect the hair in this area, water, humidity, condition or product.  Much of it depends on our own hair texture and condition to be honest.  The better condition your hair is in the less humidity will effect it.  Imagine a piece of wood as an example, untreated the wood absorbs water and swells, cracks and becomes damaged.  Now fill the wood and seal it with Polyurethane and moisture is no longer an issue.  Here in Hong Kong you are battling many factors so conditioning is the most important tool you can use.  I am going to leave you a link to my web site, scroll down to the 'Frizzies and Humidity' section and the 'Steam Treatments Area'.  These two pages have allot of information on them that is relevant to our conversation. If you have any further questions please let me know...cheers

http://hairhongkong2.blogspot.com/