Cigars usually unravel at the head because the cigar cap was cut off and there is nothing at the head of the cigar to hold the wrapper on. Proper cutting techniques are outlined in an answer below. If the cigar unravels at the foot, it could be an indication that the cigar was not humidified correctly and is dried out so the natural adhesiveness of the cigar is no longer there to hold the wrapper to the body. An unraveling cigar can indicate poor quality, but 9 times out of 10 (with premium cigars), the issue is due to dryness.