A perfecto is shaped at both ends. The foot may be closed until you cut or punch it; the head is capped to a point or a nipple; the middle is the widest part. It is a figurado, and it asks more of the roller than a parejo.
Because the foot starts small, the first minutes can smoke differently from the barrel. That is geometry. It is not a separate tobacco.
Arturo Fuente’s Hemingway line helped put figurados, including perfecto-family shapes, back in front of U.S. smokers in the 1980s after they had become scarce outside Cuba. See the brand profile.