What is the primary advantage of a dry suit over a wetsuit in terms of temperature management?

The primary advantage of a dry suit over a wetsuit in terms of temperature management is the ability to use insulating layers. A dry suit keeps the diver completely dry by creating a barrier against water, allowing for the incorporation of various types of insulation underneath the suit. This layering system can be tailored to the conditions and the diver's comfort, providing better thermal protection in colder water temperatures.

In contrast to a wetsuit, which relies on the water that enters the suit to provide insulation by trapping a thin layer of water against the skin, a dry suit prevents this water exchange entirely. This enables divers to wear thicker or specialized thermal layers which can dramatically increase warmth and comfort during dives in low-temperature environments. Using multiple layers also allows for versatility, as divers can adjust their insulation based on varying dive conditions.