Clif Shot Bloks is a product that I personally favor for nutrition needs during extended endurance events. I add these to my nutrition plan because the sports drinks can get overly sweet and tiresome during half and full Ironman events. Gels are OK but then again, too sweet after awhile.
Clif Shot Bloks are soft chews that provide calories in the form of glucose AND provide a dose of electrolytes. As a side note, new research questions the true needs of additional electrolytes during an event, but in any case, they are found in Clif Shot Bloks. One last benefit is that the chews offer a little more substance versus sports drink, so this can be a welcomed change when you crave something different during your bike, run, etc.