Unlike most other types of energy food which are solely carbohydrate-based, the 4:1 Advance Training Bar is, as the name implies, 4 parts carbo to 1 part protein.
Zipvit are heavily involved with the Cervélo Test Team and these ZV10 energy chews were first used by Thor Hushovd and Roger Hammond in the 2010 Paris Roubaix. The outcome? Second and fourth places, respectively. Okay that's probably not all down to the chews but they are tasty, and a good, easy-to-eat mix of the stuff you need when you're out riding.