How did Vikings stay warm on ships?

How did Vikings stay warm on ships? Vikings would have used lanolin-rich wool, which is naturally water-repellent and has the advantage of retaining heat even when wet. They might also have used leather “waterproofs,” which had been treated with animal fat.

Vikings would have used lanolin-rich wool, which is naturally water-repellent and has the advantage of retaining heat even when wet. They might also have used leather “waterproofs,” which had been treated with animal fat.