Monster Energy Ultra - Zero Sugar, Full Flavor. A light, crisp, and refreshing guava flavor all on its own, Ultra Vice Guava is great for any occasion. Light, crisp, and super easy drinking with a tropical tiki twist, Ultra Blue Hawaiian is a killer combo of exotic island fruit flavors that are big on taste. Juicy, ruby red grapefruit flavor combined with the Monster Energy blend from our secret stash, everyone from boomers to zoomers is down with Ultra Fantasy Ruby Red.