This variant of the heated Kwark undersuit is designed for divers who plan very long dives in cold water and where the failure of the heating system can have dangerous consequences. This version therefore has two independent heating systems on the left and right sides (i.e. each heating element is double and with two separate connecting cables). These redundant systems are powered by a tightening bushing with two separate cables from two separate batteries.
This solution allows you to do without a heated vest as a backup. You can also connect heated gloves and/or heated socks to this heated undersuit.
