Flexibound books, also known as flexibinding is a bookbinding style that sits between paperback binding and hardback binding in terms of its structure and cost to manufacture.

The cover is made with a flexible card stock, rather than a rigid binding board, meaning that the end result is a lightweight book with a flexible cover.

The finished cover overhangs the book block, so the general appearance is similar to a hardback. In fact all production stages up to the casing-in process are the same as a hardback including sewn sections, affixing endpapers, the option of adding head and tail bands, all of which gives the end result an inherent strength.