The first models of Ledge sleeping bags saw over 10,000 nights of wilderness use before they became available to the public. As a company, they not only pride themselves on their designs, but on the fact that they test their designs. They create products and use them to ensure their performance. Ledge sleeping bags continually evolve, looking for ways to make them better or more attractive in design, style, and function. Some companies leave the same designs "on the shelves" for years but you won't find that complacency with Ledge. You will find forward-thinking that gets implemented in a superior product season after season.