Fast hydration & virtually calorie free Improves performance Physical & mental boost SiS GO Hydro + Caffeine builds upon the scientifically based formulation of SiS GO Hydro by ensuring you are effectively hydrated for performance whilst also providing 75 mg of caffeine per tablet. As an effervescent tablet that readily dissolves in plain water, it represents a highly practical approach (simply drop one tablet in your 500 ml water bottle) to ensure that all of your electrolyte, fluid and caffeine requirements are met in its most simple format. The addition of caffeine has been repeatedly shown by sport scientists to improve performance by providing both a physical and mental boost just when we need it. SiS GO Hydro is a practical strategy to ensure hydration without the calories. Not intended for use by persons under the age of 16.