Isotonic is the UK's best selling a high electrolyte drink mix. Fluid replacement and carbohydrate fuelling are critical factors in performance, when training or racing in warm conditions. Now with Supercarbs, High5 Isotonic is designed to provide the fastest possible fluid replacement and maximum delivery of carbohydrate energy in training or racing. When independently tested against a normal sports drink (SIS PSP22) Supercarbs provided 23% more energy to the muscles, and 40% better hydration. Initially designed for special forces, Isotonic has been race proven by athletes in hot weather racing around the World. This includes the Marathon de Sable, 135-mile Ultra Marathon in Death Valley and cycle racing around Australia (15,000km) in temperatures of 45’C. Top teams in motor racing and professional cycling use High5 Isotonic. With it's light fruity taste there is no faster acting or more effective sports drink.