The technology used to build Kumo Boards was originally developed for the military to create rugged, lightweight, portable panels. We adapted the technology and patented it's use for inflatable balance boards, allowing us to create remarkably rigid yet surprisingly soft boards that are indoor-friendly for humans, walls and furniture!  During the prototyping process we discovered that adjusting the amount of air pressure inside the board changes the difficulty and performance characteristics. This is a big reason why Kumo Board is so versatile and completely unique in the balance board world.