SiS Hydro tablets are a zero-calorie electrolyte tab for the rides where you need hydration without extra fuel. They suit shorter rides, hot days, recovery drinks and anyone who prefers to take their carbohydrate as food rather than in a bottle. Each tablet dissolves in 500ml of water and delivers a balanced electrolyte profile built around sodium, the mineral you lose most in sweat, plus potassium, calcium and magnesium. Replacing sodium is what actually helps you hold onto fluid, which is why plain water can leave you feeling flat on a hot day. The tablets are light on flavour and easy to drink over long periods. Key features Zero calorie, no carbohydrate Sodium-led electrolyte profile for genuine fluid retention 1 tablet per 500ml of water 20 tablets per tube Informed Sport certified Use alongside gels or bars when you want to control fuel and hydration separately. Also worth taking after hot rides to rehydrate properly.