Hannah features a Trek-Dry vamp lining. Each pair includes one pair of contoured footbeds and two pair of foam spacers. The footbed and spacers are removable and can be combined to customize the fit from Medium to Extra Wide or removed to allow for the use of orthotics. The outsole is made of a new type of polymer we call "Oasis Grasp". This has been specially formulated after extensive testing and the result is a unit sole with excellent cushioning properties that is durable and provides excellent traction.