I don't thing the Twin Tails cap is an earflap cap. I think it would start out as a regular cap, and then when you reach the point of beginning to decrease, one would divide the sts onto two needles and knit each of them in the round into a long cone..... Might have to increase a few at the beginning of the tails.... Shouldn't be too hard to figure out if one doesn't mind the hassle of frogging that may have to be done to get it "just right".