The Water Pillow by Mediflow Gel-foam pillow twin pack -The first and original water pillow, clinically proven to reduce neck pain and improve sleep. 100% Cotton Made in US Cool gel foam top layer Ventilated to stay cool all night long Special foam spring center to maintain support Adjustable water base provides adjustability to any level of support. Water base responds to head movement automatically as you sleep for proper alignment and support Made in the USA