Here is great item that can be used to either convert your existing pillow to become a WATERPILLOW or to make up and custom design your own WATERPILLOW. This is a tiny water mattress, size 40cm x 60cm, that slips inside the pillow case and rests directly on top of the waterbed mattress, drawing warmth from the mattress. The amount of water to go in the water bladder can be adjusted to find the optimum comfort support for neck and head. A very hygenic product that has the flexibility to be separated from the remainder of the pillow for washing or changing, and will give years of superb service. Completes the waterbed experience by providing the same wonderful support for your neck and head that you obtain for the rest of your body from the waterbed mattress. This versatile product is capable of being used as an air pillow or cushion, folding flat for travel and use indoors and outdoors. Buy two for extra savings.