The average size of the full-faced helmets should weigh around 3.25 – 3.5 pounds. Some of them weigh less, but some might be heavier. But that doesn’t mean that they are of lousy quality. It is essential to consider the weight that’ll be put on your head. A lightweight helmet might not firmly fit your head. Such unsettled helmets might interrupt the rider’s focus, and this could lead to a major accident.