Which Fourth Element Undersuit Do I Need?
There is no generally valid rule about what Fourth Element suit to wear in different water temperatures. An individual diver's physical condition, body morphology, rate of work and working conditions and any recent exposure to cold, will influence how long he or she can tolerate exposure to different temperatures. Fourth Element give a recommendation of the range of temperatures suitable for Fourth Element undersuits with a trilaminate drysuit, but they are intended as a guide only.
As a general rule, if you are diving with a neoprene drysuit, you should be looking at the Fourth Element Arctic and Xerotherm suits. If you dive with a membrane or trilaminate suit, consider layering the Fourth Element Xerotherm with the Arctic and possibly adding the Ozone outer layer for extreme conditions. The Fourth Element HALO 3D and SubX are designed with trilaminate suits in mind for use with a base layer.
Fourth Elements Guide On Combining Thermal Layers
Fourth Elements drysuit diving thermal protection garments are designed to be used as part of a layering system which may be modified according to diving conditions. As a general rule, begin with a wicking base layer next to the skin - choose from either Fourth Element drybase or xerotherm. Then add a mid layer usually Fourth Element Arctic, or in very cold conditions, a Fourth Element SubX. The Ozone outer layer can be worn over the Xerotherm or the Arctic. You may find certain combinations work better for your style of diving, your drysuit and your personal temperature tolerance.
Safety In Cold Water!
There is no generally valid rule about what suit to wear at different water temperatures. An individual diver's physical condition, body morphology, rate of work and working conditions and any recent exposure to cold, will influence how long he or she can tolerate exposure to different temperatures. There will always exist great individual variability in thermal tolerance. The temperatures shown are approximate ranges for comfort for the different thermal performance of suit materials. The thermal performance of the suit material can be significantly reduced at depth.Fourth Elements Interactive Choosing Your Undersuit Tool