Thermal protection of a wetsuit is limited to insulating your body and minimizing heat loss. You are always losing heat. It is just a matter of how much. When diving, as you descend in the water, your wetsuit compresses because of the water pressure. This compression of the wetsuit reduces your buoyancy and thermal protection. There is no way to make up for the lost insulation once you're in the water. The Thermalution® undersuit/rash guard is worn under the wetsuit and generates sufficient heat to keep you warm despite losses through your wetsuit.
Also, the thickness and quality of neoprene determine the wetsuit's performance. The thicker the neoprene is, the warmer you'll stay, but thick wetsuits are expensive, tiring to put on and take off, and limit your movement. With a Thermalution® undersuit/ rash guard, you can say good-bye to thick wetsuits and enjoy a fun cold water sport as if the water were warm.
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