Giga sessions are those Hair Transplant session in which more than 4000 grafts are transplanted. This is Changing trends in hair transplant surgery. As techniques improve, the no. of grafts that can be transplanted in one session has increased. If the hair loss is truly extensive, one or two sessions might not be enough and at such a time, you will need a solution that will help cover more area, in the minimal amount of time only Giga Session is the best solution for which you should opt for.