I was looking up diapers that my wife and I could buy and I found these:
Big bedwetters left high and dry in diapersand also mentioned here
Japan messes up with potty training
Some articles I read are saying that this trend of wearing diapers later in life is creating a large subculture of DLs and pantswetters. There is alot of japanese peeing and diaper material out there. It is a very interesting read.
Anyway here is a link to the two styles of diapers. Site is in Japanese though, sorry.
Boys & Girls