Relevant hair: moist and dry Thermal conductor substance: eco-friendly alloy Thermal conductor diameter: 16MM-20MM Temperature control adjustment: three sections This is certainly a vital difference. For those who play in a very youth league, ALL helmets really should be ABS plastic and if you play within an Adult league (highschool) https://zionjdwas.blogsidea.com/37197623/the-2-minute-rule-for-riddell-speedflex-adult-large