Master Spas signs deal with Ironman World Championship Master Spas, a leading manufacturer of hot tubs and swim spas, is proud to announce its official partnership with the 2017 IRONMAN World Championships, an annual culmination of IRONMAN Triathlon qualifying competitions held around the world. Master Spas has been selected as the Official Swim Spa of the 2017 IRONMAN World Championships, which is scheduled to take place in Kona, Hawaii, this October. This is an exciting opportunity for Master Spas to work with some of the most elite endurance athletes from around the world. The Master Spas brand is built upon the belief in both the physical and therapeutic benefits of spas and hot tubs. A selection of Michael Phelps Signature Swim Spas that are specifically designed to aid individuals in training for endurance, as well as post-training recovery, will be showcased at the event.