Allegro 8300 vortex cooling vest, standard delivering constant and adjustable cooling or heating, the vortex vest is especially popular for workers in confined spaces as well as foundries, steel mills, asbestos abatement and paint baking operations. With no moving parts, the vortex tube forces a simple heat exchange to separate compressed air into hot and cold airstreams. The pvc vest delivers continuous cooled or heated air through its perforated, inner lining. This vest offers full range of motion and can be worn under protective clothing.