Dave: I'm sure you've done this but make sure you have show populated selected for the hair to show the clumps. It won't show clumps on just the guide hairs. Spanki: After messing with this for a bit I can give you your answer. The clumpiness clumps hairs together from the same polygon. This is cool! You can control where the clumps are by the geometry. Here is an example with the Hi res ball prop.