The diffuse air vest is available in three sizes and provides continuous cooled (or heated) air through its perforated inner lining. The durable plasticized PVC vest allows full range of motion with no airflow restrictions; and does not absorb sweat or other contaminants. The vest can be worn under other protective clothing and features a collar that can be unfolded to deliver airflow to the neck and face. A vest extension is also available to accommodate varying sizes.