Post-It notes are great, but let's face it, they don't do well in extreme conditions. They have always been for use pretty much exclusively in the office. Until now. Post-it Extreme Notes let you leave notes in less than ideal conditions. These are not your average sticky notes. They’re made with ultra-strong dura-hold paper and adhesive to be water-resistant, durable, and writable. You can use them both indoors or outdoors. They even stick to textured and difficult surfaces in hot or cold environments. Now you can leave a note practically anywhere.