Hypothermia
Also: hypothermia, chilling
Hypothermia means the body's core temperature has dropped below 35 °C. In water this happens much faster than in air.
Wikipedia describes stages: first awake with shivering (32 to 35 °C), then drowsy without shivering, later unconscious. Care is needed even after rescue: move hypothermic people gently, wrap them up out of the wind, keep them warm and call for help.
On packraft trips, hypothermia threatens even without capsizing: wet clothes, wind and long hours in the boat. Spare clothes in a dry bag are a must.
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Sources and further reading
Research as of 13 Nov 2026. We have marked manufacturer information as such.