Invisible on Everest is not simply about mountaineering equipment; it is about the bold free spirits who drove the key polar, mountaineering and gear innovations over the last century and a half. Tales of disaster and discomfort serve as vivid contextual backdrops for breakthroughs in climbing and cold-weather equipment and are often seen to be the catalysts that drove these innovations. Invisible on Everest reaches out internationally and tells the story of passionate and persistent endeavors that in some cases lead to success and in other instances heartbreaking defeat and disaster.