This is a very small device OFLAMERON the size of a plastic water bottle and weighing 1-1.5 kilograms.
Such a device can be made in thousands of factories around the world and it will cost $ 20-30
Any naval pilot or sailor can have this device because it can protect it from cold water not for 24 hours, like a wetsuit, but for 3-4 days. And it will help keep you warm even if you don't have a wetsuit at all.
This device can be used by travelers, training or military personnel in the Arctic. If the situation becomes critical, this device will not let you freeze for 2-3 days, even in very severe frosts. The device can be easily adapted to protect against polar bears.