The Collapsible Travel Bowls are made from tough, hard-wearing, flexible and versatile BPA free silicone. Each bowl is made as a whole piece, preventing the need for seals which can perish or split, meaning less leaks and punctures on your adventures. Silicone is made from sand instead of petroleum plastic or rubber, so the manufacturing process is less harmful on the environment. The bowls are made with no chemicals, so while being tough and hard-wearing, they are safer for your dog. The Collapsible Travel Bowls are 100% recyclable.