Warm Tradition Eco Comfort Hot Water Bottles are an eco way to stay warm and comfortable. Eco Comfort is free of PVC, BPA, Plasticizer & Phtalates. Once the bottle is filled with hot water, the bottle becomes soft and pliable and molds to your body. Eco Comfort has so many benefits and uses - soothing aches & pains, easing sore back pain, melting away muscular tension, stress relief, menstrual pain comfort, bed warmer, keeping hands and feet warm, diminishing arthritis pain, soothing children, creating a restful night sleep, television companion, book buddy, easing ear aches, dog and cat's warm friend, keeping warm during winter sports, traveling companion, baby colic soother, pregnancy and labor pain relief...the benefits are endless! All you need is access to hot water - no electricity, no microwave - all natural relief! Warm Tradition Hot Water Bottles are made in Germany under strict European safety guidelines. Each hot water bottle is odorless, safe and fully recyclable. It is designed to allow the heat to last for hours - an average of 6 hours, in fact. The bottles are integrally molded making them seamless, preventing leaks and cracks to occur. The mouth of the hot water bottle is extra large which allows for easy filling and prevention of spills. Eco Comfort's unique 'Screw On' cap makes it simple to open and close the bottle securely with very little effort. Each hot water bottle has an approximate volume of 2 liters. All of Warm Tradition's hot water bottles come with a 2 year guarantee against manufacturing defects.