Dust jacket covers protect dust jackets from wear and tear, dirt, moisture and handling. Clearsleeve is a good all round choice for protecting the dust jackets on your books. These covers not only protect the dust jacket but also add a layer of protection for the book inside the dust jacket. For collectible books, where much of the value resides in the jacket itself we recommend using archival quality dust jacket covers. These won't degenerate with age and are chemically inert to ensure they have no adverse affects on fragile papers.