Michael Phelps Legend Series Spas are certified to the California Energy Commission (CEC) as meeting Title 20 requirements. We use Icynene foam technology that has dramatically raised the standard over urethane foam insulation systems used by almost all U.S. spa manufacturers. Icynene is polyicynene expanding foam insulation that is environmentally safe. It allows foam to be sprayed without ozone destroying gases and without gas emission hazards.

The Icynene Insulation System expands to 100 times its initial volume in seconds to insulate and air-seal the spa envelope. The resulting blanket of soft foam insulation forms a continuous thermal barrier that eliminates cold spots and significantly reduces energy costs. A consistent, comfortable temperature is maintained inside the spa, while cold air is kept outside, and condensation, mold and mildew prevented. Unlike urethane foam-based systems, which lose half their R value in as little as 2 years, Icynene maintains its insulation value for the life of your Master Spa.