Yes, it's the V4 Hair Proxy.  I guess he must have changed the name, since DAZ co-opted "Genesis."

I bought the product when he had a store here; it included proxies and skullcaps, hair, etc. for several figures.

However, it is pretty easy to use with any figure.  Skullcaps don't have to fix exactly with dynamic hair.  Kirwyn's skullcaps are designed to fit inside the figure's head, so the hair appears to be growing naturally out of the scalp. 

Another neat trick he used was to model the skullcaps tipped back 30 degrees.  That way, the hair grown from them naturally falls back from the figure's face.