Does anyone know where they sell lilo hot water bottles, they are not normal rubber or plastic but more like the silicone used for baking products and such, softer and more flexible. They keep hot longer that older types, one I have is about 12 years old, used every night for my illness all year round with boiling water, would like to find more. Don't know where wife got this one from. Quality of material made from makes them safer against splitting or bursting.