The Ice Breaker is designed to be worn under any drysuit, this millennium award winning product keeps you warm in the most harshest of environements both on surface or subsurface. Systems warm to 44 degrees and the smart fabric self regulates the temperature. The system must only EVER be used with 12 Volt power source. Typhoon lithium power cells are rated to 100mt, with approx 50 - 60 minutes of power. The system can be disconnected underwater to change power sources.