What components are used in layering to create insulation in a dry suit?

The correct choice encompasses the fundamental principles of thermal protection in diving. Layering in a dry suit typically involves utilizing materials that create insulation by trapping air. The air trapped between layers acts as an insulator, minimizing heat loss from the diver's body to the surrounding cold water.

When dressing for a dive, dry suit divers often wear base layers made from synthetic or wool materials, as these can effectively wick moisture and provide added insulation while allowing air to be trapped. This combination enhances thermal protection. However, using water for insulation is not effective, as water conducts heat away from the body much more efficiently than air, which defeats the purpose of using a dry suit.

This understanding emphasizes that layering is primarily about the strategic use of materials to trap air for insulation, making the choice of material and air the critical components for maintaining warmth during dives.