The Vietnamese, in common with most Asian folk, are obsessed with whiteness of skin.   Thus I cannot buy (so far) a body wash or deodorant which does NOT contain a whitening agent!  I know they travel on two wheels all the time, which leads to weather burn, but is it (in the tropics, mind) to wear a windcheater, or tracksuit top over your shirt, plus long trousers, socks, gloves, helmet and face mask?  As, when they are on foot, the outfit is much the same, minus helmet, but substituting hat who are they preserving this white skin f or?