Pro-Bar XS high protein food bar contains 30 grams of our high quality fast and slow protein matrix (milk protein isolate, whey protein concentate and micellar casein) Pro-Bar XS high protein food bar is a delicious and soft-textured chewy crisp high protein food bar that is low in simple sugars. Pro-Bar XS high protein food bar is easy to transport and can fit into pockets, bags, car glove compartments etc and is a convenient way of ensuring your protein demands are met no matter where you are.