patented Extend dEsign, 339H-1 the revolution in swimspas is complete. This new inspired styling is unlike any swimspa that's come before. The uniquely curved lines are an ingegral part of its technical achievement. With a patented propulsion system and exclusive Therapy Seat, the 339H-1 delivers a luxurious experience. The Super Jet system provides a wider, deeper and smoother current, While giving you a swimming experience that's far superior to any other swimspa, allowing you to customize its flow for any level of swimming.