The Girdle Book is a medieval binding structure featuring a long extension of leather at the tail of the book, often terminating in a decorative knot or hook that could be attached to the reader’s belt. The twenty-three known examples of girdle books date from 1400-1550. This model has many features typical of medieval bindings: Text block sewn on double raised supports, wooden boards shaped all around with special attention given to the inside spine edge, vellum spine linings extend beyond the text block and attach to the inside of the boards, text block laced onto boards and laces pegged in, sewn headbands also laced into the boards, corner tongues, strap and pin closure, corner bosses, vellum for-edge markers. The model mirrors approximately two thirds of the 23 extant girdle books: the leather extension is part of the primary binding. In the remainder, the book is covered normally, then is placed in a chemise with a leather extension.