This innovative Crystal Gem-Water Bottle features borosilicate, double-walled glass for insulation. It's an evolution of the ViA Collection's signature modular design. So, just like the original ViA Gem-Water Bottles by VitaJuwel, you can swap out the GemPod at any time. Whatever your brew of choice, it'll stay nice and toasty inside while your bottle stays cool to the touch. It even works with your favorite ice cold drinks!