Legal pad is tough enough to survive any of Mother Nature's onslaughts. Notebook repels water, oil, grease and more. Works with Rite in the Rain all-weather pens/pencils, wax markers and crayons in wet or dry applications. Permanent markers and standard ballpoint pens work under dry conditions. Will not work with gel pens, most highlighters, fountain pens or water colors. Paper is wood-based, recyclable, and survives rain, heavy sweat, mud & grime, heat & humidity, oil & grease, sleet & snow, fog & mist. Top spiral bound, gray-tinted pages reduce glare and give a professional appearance. Front of each sheet has Universal page pattern for journaling or graphing. Each sheet is perforated for clean, easy removal, and the back of each sheet is left blank so that it can be run through a laser printer. Inside cover includes convenient measurement guides. Mini ruler included on the back of the legal pad for quick measurements.