All-Weather Wire-O Notebooks are fully prepared to handle any challenge Mother Nature throws their way. Polydura covers create a tough but flexible outer shell to defend your work, wherever work takes you. All-weather, archival-grade paper preserves your notes from the elements & the passage of time. Corrosion- & impact-resistant Wire-O binding takes a lot of abuse without getting bent out of shape. Conversion charts, map scales & a standard-scale ruler printed on the inside-back cover are always at the ready to help the adventurous navigate the unfamiliar. Pocket-Sized Indicator: Y; Book-Binding Type: Wire-O; Book-Binding Details: Twin-Wire: Flexible Cover; Book-Binding Type: Side.