With ceramic inner layer Premium stainless steel exterior Made of BPA-free and FDA and EU-approved materials Includes a patented and spill-resistant push-button lid Take coffee or fruit juice to-go using the 1L Frank Green Ultimate Ceramic Reusable Bottle in harbor mist grey. Its unique ceramic cup protects the flavours of your drinks and is lined with triple-walled stainless steel to keep them hot or cold for longer. A simple push of its patented lid button allows spill-proof, one-handed drinking.