摘錄自Yanko網站上baja網友的留言:
"Any edge on the surface of the helmet is a denger of twisted neck in slide accident. Its a common practice to make surface of the helmet as smooth and as features free as possible. Also any kind of that features add to noise. Some manufacturers spend millions in aerodynamic tunels just to get it right and it makes a lot of diference at sale points. Aluminum is as needed as the brick or porcelane. Aluminum doesn't compres or absorb energy without changing shape and deforming. Leather is massively resistant to any other surface. It might save your precious head from scraches by the price of twisting your head around like electric screwdriver. Aluminium helmet with other fabrics is a fashion statement ready to kill you. This is typical design over function."