Indicates into how many separate air chambers the air sleeve is divided. These zones inflate sequentially so that gradual pressure is applied; the greater the number of chambers, the more uniform and precise the pressure distribution becomes.

Refers to the dimensions of the air chamber so that it fits correctly on the part of the body for which it is intended. It usually concerns air chambers for the lower limbs, and the selection is made based on the circumference and/or the length of the limb supported by the manufacturer.