Our 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 drybase or xerotherm. Then add a mid layer usually Arctic, or in very cold conditions, a 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.
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.