A perfect thermal insulation under your drysuit, using Fourth Element's Xerotherm.
The vest is made of Polartec® Powerstretch®, originally developed for use by NASA. Since then, other institutions such as the FBI, the Norwegian Navy, and the British police unit have used Xerotherm as their preferred thermal layer. The undersuit has been both to the top of Mount Everest and down to explore the Titanic.
The vest is produced from Xerotherm fabric, which provides the fastest warming effect among all products in Fourth Element's range.
Sweat and moisture are automatically drawn out through the fabric along fine fibers and spread across the outer layer of the undersuit. This way, Xerotherm ensures that you stay dry and warm throughout the dive.