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Free shipping for this item. Purpose-built for the street. The standard life expectancy of a fibreglass helmet is seven years, due to the deterioration of the shell structure over time; this is why Arai runs a 7-year warranty from date of manufacture and a 5-year limited warranty from date of purchase. Custom Fit Options. Arai Visors. More products by Arai. On the rounder end of the head shape spectrum, the Quantum series has always been the "go-to" helmet of choice.