Exclusive to MAAX Spas, the Thermo-Lock™ insulation system now features the eco-friendly ‘BlueMAAX’ insulation. Made from recycled natural fiber, it is approved by the U.S. Green Building Council. The insulation contains no chemical irritants, is treated with a borate-based solution to prevent mold/mildew growth, pest infestation, and acts as a fire retardant. BlueMAAX® replaces urethane foam commonly used in “foam filled” hot tubs. The “foam filling” process in conventional spas can produce as much as 50 lbs. of volatile organic components (VOC’s) which are harmful to the environment. The new energy system also allows for easy service access, and can be taken out and put back together to factory specifications right in your home.