casco oneal adv kini red bull 1 0In a comparative test by the leading European motorcycle magazine, "MOTORRAD," the O'Neal SIERRA helmet was among the test winners and was awarded "recommended purchase" in the Adventure Enduro helmet category. The shell is made with high quality ABS Multiple air vents for optimal ventilation and cooling Microlock closure Padded comfort lining, removable, sweat absorbent, and washable Bluetooth Ready with cavity for internal speaker and rubber ring on