This fun palm-sized case-bound codex book is waterproof!! For those of you who like to write in the bathtub, bike commuters & outdoorsy types...or if you just have to cry a whole lot...this book is for you! It's made with special Rite In The Rain paper that is designed for field workers and is fully waterproof! The cover is made of coated cotton fabric and is water resistant. Paper can be written on with a pencil, regular ballpoint or felt-tip pen (not waterproof), or special Rite-In-The-Rain pens!