crème de la crèmecrème de la crème, creme de la creme /ˌkrem də lɑː ˈkrem/ noun [singular] 
the very best of a kind of thing or group of people: 
Oxford and Cambridge are often seen as the crème de la crème of British universities.
the very best of a kind of thing or group of people: Oxford and Cambridge are often seen as the crème de la crème of British universities.