H1 - keeps it simple by providing the right mix of Sodium & Carbs for all your miles. Meant to mix right in your bottle. No flavors just a light sweet taste to prevent flavor fatigue.
H1C - has the same carbs and sodium as H1, but with an added 100mg of caffeine. This is for those early morning wake-ups or late nights, when you need a little (or a big) boost.
