I have a small-ish head, and regular caps really slide around on me. The TYR junior size fits perfectly and comfortably, and stays in place for my whole workout. I personally like the orca design (bought this to replace my much-loved pink camouflage piranha), but of course tastes vary and not everyone feels comfortable rocking the dorsal fin. Great quality, too- used my previous TYR cap probably 3X a week for 2 years before it finally developed a tear.