A perfect thermal insulation is obtained in your drysuit, when using Fourth Elements Xerotherm two-piece underwear.
The undergarment is made by Polartec® Powerstretch®, and was originally developed for use in NASA. Later, other institutions such as the FBI, the Norwegian Navy and the British police have used Xerotherm as their preferred undergarment, it has also been used at the top of Mount Everest and a trip down to the Titanic.
The undergarment s made of Xerotherm fabric, which provides the fastest heat output of all products in the Fourth element's product range.
Sweat and moisture are automatically expressed through the fabric along fine fibers and spread on the outer layer of the base. In this way, Xerotherm ensures that you are dry and warm throughout the dive.