Dimension One Spas®, founded in 1977, is the leading manufacturer of award-winning hot tubs  and home to the world’s first curvilinear spa. With over 40 years of pushing the envelope of what a hot tub should be, D1® integrated intelligence, utilized the most durable materials and given you more features that give you exactly what you need. Not sure exactly what to consider when buying a hot tub? Check out our Spa Buyers Guide.