vinyl with skin friendly velour cover warm it up in the microwave or in a warm water bath keeps its temperature longer than a normal hot water bottle made to fit the human body made in germany enjoy the warming warmth of the supple moor pillow it will adjust to your body and gives out its warmth over a longer period of time it only takes 2 minutes in the microwave up to 650 watt and it is then charged up to give off long lasting comfortable warmth