In reply to mistrelo:
It depends on what you want out of the lining as to which shorts you might buy
A lot of the liners in them are just lightweight pants material and in no way supportive, so fine if you want that for the purpose of not wearing underwear, think hot summer days
If you want some sort of support or compression there are versions out there, I have had a few from Salomon which maybe been good but pricey
At the moment I am rocking skins compression undershorts with a standard Montane dragon lightweight short with no inner over the top which works well for the slightly colder or wetter days