Wherever shells are already ruined by a chemical reaction from using incompatible elements which include: This is an important difference. Should you Engage in within a youth league, ALL helmets ought to be ABS plastic and when you Perform within an Adult league (highschool) ALL helmets needs to be polycarbonate. https://speedflexadultlarge15059.blogspothub.com/30540197/what-does-riddell-speedflex-adult-large-mean