Infant Heel Warmer Disposable Contains sodium Acetate and Water Specifications ... /MSDS/ROHS 4.non-toxic,reusable,instant,portable... Infant Heel WarmerDisposableContains sodium Acetate and WaterHeats to 105°FTO Activate: ... of both hands. Knead pack and secure warmer to heel by wrapping strip around foot.CAUTION: To avoid burns, ... .Contents: Sodium acetate. waterNon-toxic non-caustic. Infant heel warmer