This is the Medium sized version of the Aircast XP Diabetic Walker.It differs from the traditional XP model because it has a higher rocker-style sole that helps to provide maximum pressure relief when walking, and it also has a special dual-density, removable insole that minimises localised pressure.In other respects, it is similar to the XP model: it has three adjustable straps, good ventilation and outstanding grip on the sole. The walker itself affords excellent protection against knocks and shocks, and the inflatable liner provides very effective immobilisation of the foot for rapid recovery.