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Extend the life of your Octal helmet with a replacement Octal Adjustment System. The Octal Adjustment System only fits with the POC Octal helmet. Note: This item should only be used in the product it is intended for. POC accepts no responsibility for problems or injury as a result of wrongly fitted parts or if this part is used in another model. For the safety of our riders, we always recommend replacing your helmet every 1-5 years dependent on use, and especially if your helmet was involved in a crash.