Bfoot Science is derived from proven principles of various disciplines, including neuromuscular physiology, rehabilitative medicine, musculoskeletal mechanical physics and adaptive bone remodeling. Through 20 years of research and using the latest advances in medicine and technology, Bfoot Science has developed a unique Arch Activation Foot Strengthening System. And it's easy to use! Each Bfoot Science Arch Activation System comes with a pair of insoles to fit into your existing footwear and a series of progressive arch activation inserts. To start, just pop Level 1 into the underside of the insole, slide them in your shoes and get on with your day! It feels like a mini foot mage, sending waves of comfort throughout your body. That sensation is actually your foot muscles waking up and getting stronger. When the sensation fades, usually within a week, your feet ready to move up to the next level. It's that easy! With each step, your feet become stronger and more efficient. Full length: This version has been designed with extramaterial around the toe a for trimming and is appropriate for shoes that feature a removable insole, such as most athletic and recreational shoes. Typically, the generic insole that comes with these types of shoe is slightly contoured and may interfere with how flat the Bfoot Science System is able to rest in the shoe, so it must be removed. After removing the generic insole, trim the Bfoot Science insole according to the Instructions and place it in the shoe, making sure it lies flat and flush against the ends and sides of the interior of the shoe. In some cases, the removable insole may be totally flat. You can then choose to replace it with a full length Bfoot Science insole - or - place the 3/4 length Bfoot Science insole over it. In either case, it is vital that the Bfoot Science insole lay flat, that there is as much room in the toe a as possible, and the laces kept looser than normal.