No, if you remove the air from your drysuit, creating a vacuum effect, you can adjust the thermal properties of the suit to some extent.
This technique of releasing air is commonly used by divers just before they dive to facilitate their initial descent. It is important to remember to adjust the dump valve to the desired aperture for diving once at the surface.
The Weezle undersuits have excellent wicking properties that effectively draw sweat away from your skin to the outer layer of the suit. Unlike some other undersuits, the sweat has a designated path to escape; it easily moves to the outer layer where it is absorbed until saturation occurs, usually when the wearer is knee-deep in water.