This notebook is designed for underwater use and features 25 reusable waterproof pages with refills available. It has a durable 2250D PU-coated, woven ballistic nylon cover. Clear window pockets are located on the inner and outer back covers for dive tables, checklists, compasses, etc. An attached D-ring allows for easy attachment to a belt or BC, and elastic pencil holder compartments are found inside the front cover. It is secured with a wraparound bungee cord closure.