What's the difference between a headrest bath pillow and a full-body one?

Standard headrest pillows support just your neck and upper back and rely on a few suction cups near the top of the tub. Full-body styles, like the 51-inch model in this roundup, run the length of the tub to cushion your back and seat as well. Verified-purchase reviewers prefer full-body versions for hard or deep soaking tubs, but note they use more material and can take longer to dry.