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 small knob, and the middle is the widest part. It is a figurado, and it is harder to roll than a parejo.
Because the foot starts narrow, the first few minutes can taste different from the rest of the cigar. This is caused by the shape, not by a different tobacco.
Arturo Fuente’s Hemingway line helped bring figurados, including perfecto shapes, back to U.S. smokers in the 1980s, after they had become rare outside Cuba. See the brand profile.
Full guide: perfecto and figurados. Size chart: ring gauge and length cheat-sheet.