Abstract: The present invention is generally directed to an orthopedic device for use with an orthopedic cast, which can alleviate the itching sensation that can develop when a patient wears a cast, among other advantages, such as cooling the skin below the cast, reducing the moisture in the region between the skin and the cast, as well as in some cases reducing the risk of infection. As discussed in more detail below, the orthopedic device can include a sleeve that can be mounted onto a body part, e.g., a broken limb, between the skin and a surgical cast. The sleeve is sufficiently flexible so as to substantially conform to the contour of the body part. The sleeve includes a plurality of internal channels for receiving a gas from an external source, e.g., a canister of pressurized gas, and for delivering at least a portion of the received gas via a plurality of openings onto the skin below the cast. The sleeve can include a two opposed layers between which the internal channels are formed.