A hand warming system (wet or dry) is required to minimise the risk of non-freezing cold injury in water less than 5 ºC during extended dives of up to 4 hours minimum 30 minutes. If a battery is required it should be autonomous for a minimum of 1 hour and should be adaptable to be charged at different voltages to enable it to be used worldwide.

A hand warming system (wet or dry) is required to minimise the risk of non-freezing cold injury in water less than 5 ºC during extended dives of up to 4 hours minimum 30 minutes.