Valiant Carpet Question

Subject is 1964 Valiant V-200 convertible.
I am converting to a 4 speed and will probably end up changing the carpet. Looking at pictures on the ACC site, there definitely is a formed section to fit around the floor hump which I am adding.

MY QUESTION IS: What is the difference between Signet carpet and standard carpet?

I'm guessing Signet is more deluxe, maybe loop pile vs. cut pile.