A refrigeration suit was a type of clothing used by the Breen. It was supposedly a type of environmental suit to keep a Breen's temperature at a lower level than its surroundings. The Breen theoretically wore them to maintain the cold temperatures on their home planet.
There were two different styles of refrigeration suits. The first is a standard uniform worn by regular Breen and Breen soldiers. The second was a more ornate version worn by Thots and other command officials. This style had golden lining on the shoulders and arms, as well as distinctive gold stripes that ran down the center of the top of the helmet and down the top of the "snout" section of the helmet.