While this sub has a spicy kick, it's not mouth-on-fire hot. With the mozzarella, bread and dressing, most people won't find these subs too spicy, but if you're sensitive to Buffalo sauce, you can add more butter to the Frank's RedHot sauce. Of course, if you can't get enough spice, you can always add more cayenne pepper to the Frank's RedHot sauce or add some sliced jalapeños or habaneros to your sandwich.