It is extremely dangerous to modify your helmet by drilling holes, cutting the shell and/or absorption liner. Any such actions will weaken the helmet and may cause serious injury in the event of an accident. Removing any parts such as, vents, liners, cheek pads, mouth guards, rubber trimming, etc. before use will also disrupt the intended design of the helmet and may expose you to severe injury or death in the event of an accident. Do not paint your helmet as the chemicals of the paint may adversely affect the materials used in your helmet, thereby weakening it.