Gray ankle support that provides firm support. I used this instead of a cast when I fractured my ankle. By inflating with the pump, the lower part of the calf swells and secures the foot. It's used to immobilize and prevent stress on the ankle, such as when the heel is fractured or the Achilles tendon is torn. I used it for about a month. You can find it on Amazon by searching for "Airwalk," so please refer to that. Thank you for looking.