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The Flex Cap for Hydro Flask with large opening is the ideal combination of strength and flexibility. We paid attention to ultimate mobility during development and designed every detail for effortless everyday comfort. It is also insulated, so that you can keep your favorite drink with you for longer at the ideal temperature. The Flex Cap for Hydro Flask with large opening is compatible with all Hydro Flask water bottles with a large opening and features a honeycomb insulation to keep cold drinks cold and warm drinks warm. Whether you are out and about in the countryside or stuck in the office – it is always a good idea to have an additional lid for your Hydro Flask with you. Keep the temperature of your drink longer so that you can stay active for longer and do more.