sunbaby cloth diapers -- do they need a waterproof cover or, is the diaper all you need?

Im looking at buying sunbaby cloth diapers. Dappi cloth diapers I have seen, have the diaper, a plastic or, upgraded velcro or snap fastened mesh lined outer diaper, and then the inserts. Sunbaby only has the insert + diaper. Does this mean they:1) Dont require any additional outer protection (like the others which offer the mesh lined covers for the cloth diaper)2)Dont offer an outer cover but still need an outer waterproof cover that can be found in a generic ‘fits most brands‘ version?Also, what is your thoughts about sunbaby brand and experience.Thanks!2)