"Bai Lu shows the body, Han Lu doesn't show the feet"

This is a long-standing health proverb. When Han Lu (Cold Dew) arrives, both the ground and water temperatures drop noticeably (ancient people called it 'cold originates from the feet'). It's not advisable to wear sandals with bare feet or expose your ankles like in summer. Special attention should be paid to keeping your feet from the cold and warm, otherwise, the cold air can easily invade your body from the soles of your feet.