Applicable hair: damp and dry Thermal conductor product: environmentally friendly alloy Thermal conductor diameter: 16MM-20MM Temperature control adjustment: 3 sections There is a typical dimensions for football helmets but when obtaining a single you may only ought to keep your head size in mind. Each manufacturer has diverse size parameters https://riddell-speedflex-adult-l30617.dbblog.net/4002214/not-known-facts-about-riddell-speedflex-adult-large