SAFE & NO LEAK - hot water bottle is made of rubber to ensure maximum safety and transfer the heat perfectly, keeps the water warm for a longer time. To be more safety, the temperature of the hot water should not exceed 80 degrees celsius.Passed pneumatic pressure test, 24 hour swing test. It is completely pressure-tolerant and leak proof 2 PACK PROTECTIVE WATER COVER-Come with water bottle cover to prevent the hot bottle from being in direct contact with your skinTo be more safety, the temperature of the hot water should not exceed 80 degrees celsius. WIDELY MOUTH TO FILL - With wide mouth, the hot water can easily to fill, comes with an anti-squirt stopper, safety and easily let water in and out, prevent water spitting back out. Our hot water bottle maximum capacity 900ml, suggested to fill to 2/3 SOFT WAIST COVER- Comes with very long waist cover ,designed with super soft double insert, keep warm to your hands and waist at the same time