Charles Ellicott Commentary Ruth 3:4

"And it shall be, when he lieth down, that thou shalt mark the place where he shall lie, and thou shalt go in, and uncover his feet, and lay thee down; and he will tell thee what thou shalt do." — Ruth 3:4 (ASV)

Uncover his feet. —More literally, as the margin, lift up the clothes that are on his feet; so Septuagint and the Vulgate. We are told that the custom still prevails in Palestine of owners of crops sleeping on their threshing-floors, lying with their clothes on, but with their feet covered with a mantle.