Similar hats are pretty much standard equipment in heavily mosquito-infested areas. I don't know anything about this vendor, but it isn't rocket science we're talking about: Buy one. You'll be amazed.

The only thing to look out for: How do you make sure that the lower end stays "closed", in particular when you bend forward? The net might fall away from your body, creating a very nice tunnel for the mosquitos to fly through... You prevent that from happening by combination of a piece of elastic at the lower end of the net plus whatever clothes you have on you. You can put the net under your outer jacket to make sure it stays.