Have nutrition on your person at all times with ZonePerfect® Snack Size Bars. The most popular ZonePerfect® bar flavors are available in a smaller, but still mighty satisfying, size. With 5 grams of protein and only 80 calories, a great-tasting, reinvigorating morsel is always within reach when you pack a snack for later ... a ZonePerfect® Snack Size Nutrition Bar, that is.