Reference for Bava Metzia 162:4

ההוא גברא דאוגר ליה חמרא לחבריה אמר ליה חזי לא תיזול באורחא דנהר פקוד דאיכא מיא זיל באורחא דנרש דליכא מיא אזיל באורחא דנהר פקוד ומית חמרא כי אתא אמר אין באורחא דנהר פקוד אזלי ומיהו ליכא מיא

Two men were travelling together on a road, one [of whom] was tall, and the other short. The tall one was riding an ass, and had a [linen] sheet, whilst the short one was wearing a [woollen] cloak, and walked on foot. On coming to a river, he took his cloak, placed it upon the ass, and took the other man's linen and covered himself therewith.<span class="x" onmousemove="('comment',' Because wool is more absorbent than linen, therefore much heavier when saturated. ');">³</span>

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