| Thermolock IV™ 4 Layers of Protection Quiet operation, superior heat retention, and total peace of maintain water temperature, improving mind are all benefits you'll enjoy with Thermolock™ heat efficiency. Energy created by the Technology. Providing peace of mind - Thermolock IV™ is the spa stays in the spa, and worry-free ultimate in sound and heat energy management. The unique enjoyment is all that remains, thermal barrier technology recycles radiant heat energy for faster, more efficient heating and reduced energy costs. Inside we apply a thick layer of closed-cell, high-density foam insulation to the underside of the spa shell before the plumbing is installed. This ensures a uniform thermal barrier to keep heat in the spa, while strengthening the shell. Additional high-density foam insulation is applied to the sealed ABS base, which locks in the frame and prohibits heat loss through the floor. Finally, we line all four sides, plus the floor, with patented MF- Reflectix® insulation and high density foam to create an ^B^^^l infrared thermal barrier within the interior air space. Radiant ^^^^^B heat energy from the pumps and equipment reflects back to the spa and is absorbed into the plumbing. This helps raise and |