Diving Unlimited International (DUI) was born in 1963 out of a deep love for diving and a need to stay warm underwater. Founded by Dick Long in San Diego, DUI began by crafting custom wetsuits and quickly became a trusted innovator in thermal protection. In the late ‘60s, DUI revolutionized commercial and military diving with hot water suits used in the North Sea and by Apollo recovery teams.

Today, DUI brings that same level of precision, quality, and innovation to recreational divers—offering premium drysuits, fit-focused design, and industry-leading comfort. With over five decades of expertise, DUI proudly remains the world leader in drysuit technology, helping divers explore deeper, stay warmer, and dive longer.