Rubber Hot Water Bottle With Cover Made of natural rubber Resistant to boiling water 100% leak proof Keep warm in winter Detailed TableMaterialNature ... rubber hot water bottle,2, Resistant to boiling water; 3, 100% leak proof4, Seamless moldedRubber content28%,30%,55%,etc.Cover1, Flannelet cover2, Knitted cover3 ... the bag Inner, especially rigid and sharp things. Rubber Hot Water Bottle With Cover