Review (5/5): Comfy bath pillow!
If you have a deeper tub with a slanted back for reclining, and you're in for a long soak, you will want more than a neck pillow since there's that big gap behind your back needing support. I tried attaching the pillow low in the tub like a lumbar pillow but it was too buoyant and just shimmied its way upward to the water level. So I bought a second one.