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Aqua Lung Thermal Fusion Undergarment

Thermal Fusion is a high performance diving undergarment with maximum warmth and unrivaled flexibility and fit.

Proven by science. Independent laboratory tests by the Sport Innovation Center (SPIN) validate the superior insulation value of the Thermal Fusion. Cold water immersion and controlled cold weather environmental tests confirm unparalleled effectiveness in protecting skin and core temperatures. Comparative testing against our competitors' top-rated undergarment confirms superiority. The science proves that the Thermal Fusion performed best overall in preventing heat loss in extreme environments.


  • Designed by divers. Thermal Fusion was rigorously tested by professionals to ensure the highest level of comfort and warmth.
  • Patent pending Thermal Core Technology is a unique, dual layer design, that allows the diver an unlimited range of motion, with a streamlined fit.
  • The first layer, a comfort cut thermal core constructed of Polartec 200 fleece, delivers superior warmth.
  • The second, outer layer, is a Polartec Power Stretch Pro compression skin which streamlines the inner core to the divers body, provides a custom fit, and allows maximum range of motion
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