Book format question

[Anny]

A friend of mine added a book she owns and the format confused her, so she turned to me but I'm unsure as well. She described it as a dust cover glued to the spine with no cover underneath the dust cover. Does anyone know what that's called?

[lethe]

Sounds like a paperback?

She probably means it has French flaps:

"The one format no one ever forgets is known as "French flaps", a paperback edition with folded flyleafs." (http://www.telegraph.co.uk/culture/36...)

See here for an image.

[Anny]

The material is thinner and more like a dust cover and less like a paperback cover.