What size body pillow should I buy?

Straight body pillows in the candidate pool run roughly 18 to 24 inches wide by 54 inches long, which suits most adult side sleepers who want something to hug and tuck between the knees. Taller sleepers and those who want full back-and-belly support tend toward 57-inch U- or J-shaped designs, which wrap around the body but take up far more bed space.