Made with SUS304 Stainless steel.- Double wall vacuum insulation- BPA, Phathelate free- Push botton lid and pop up straw-easy access for children- interchangeable lid-Pop Up straw and cup options- small and ultra lightweight that would fit most cup holder and is perfect for travel- stainless steel body stays condensation-free with cold beverages- straw and mouth piece can be taken apart for easy cleaning