Safe Materials: Constructed from PVC, BPA, and phthalate-free materials, designed to meet American health and safety standards; UL Tested for reliability and performance | Long-lasting Heat: Made with genuine grade A natural rubber, retains heat longer for effective use; also suitable as a cold pack for swelling and other needs | Convenient Stopper Design: Includes a cap with a lanyard to keep it within easy reach and prevent loss | Fleece Cover: Features a simple slip-on cover with a fully open top for accessibility; complies with British Safety Standard BS1970:2012 | Large Capacity: 3-liter (100 fl oz) capacity suitable for use with custom or replacement covers; provides extended warmth during cold nights