A Clif Bar is basically a Power Bar, except shorter, fatter, moderately better tasting and made by a different company. They are soy-based, which is a good thing, because soy makes you strong. They come in a vareity of appetizing sounding flavors like Crunchy Peanut Butter and Chocolate Brownie. All the flavors taste roughly the same, like a combination of artificial preservatives, flavors, with a hint of soy. They taste like chemicals. However, like Power Bars, they are an excellent source of energy. If you munch on a couple during a hard day of Ultimate, they really will help you keep going. As the name suggests, they have a rock climber on the packaging, but on the back they claim that Clif Bars are actually named after one of the founder's fathers. I personally prefer Clif Bars over Power Bars, and I usually eat 2 or 3 every day I spend at an Ultimate tournament.