Diving Unlimited International (DUI) is an American diving equipment

Diving equipment

Diving equipment is equipment used by underwater divers for the purpose of facilitating diving activities. This may be equipment primarily intended for this purpose, or equipment intended for other puprposes which is found to be suitable for diving use....

 designer and manufacturer. DUI is particularly well-known among recreational

Recreational diving

Recreational diving or sport diving is a type of diving that uses SCUBA equipment for the purpose of leisure and enjoyment. In some diving circles, the term "recreational diving" is used in contradistinction to "technical diving", a more demanding aspect of the sport which requires greater levels...

 and technical

Technical diving

Technical diving is a form of scuba diving that exceeds the scope of recreational diving...

 divers as the maker of high-end drysuits. DUI also manufactures drysuits and associated products for all the branches of the US military and friendly foreign military around the globe.

DUI has several patent

Patent

A patent is a form of intellectual property. It consists of a set of exclusive rights granted by a sovereign state to an inventor or their assignee for a limited period of time in exchange for the public disclosure of an invention....

s related to diving equipment and drysuits. The company was founded in 1963 by avid diver Dick Long. DUI's manufacturing facility and main offices are located in San Diego, CA.