Correct maintenance involves reconditioning within your helmet not less than every two (two) years by NOCSAE Accredited Reconditioner working with only new factory replacement liners during the reconditioning process. Proof of any of the following problems will run to void this warranty: Ask for a Estimate Enjoy the Online video https://martinisshf.angelinsblog.com/30134166/about-riddell-speedflex-adult-large