RNOX New Ultralight Cycling Helmet MTB Helmet cycling Safety cap Bicycle helmet For women Men Racing Bike Equipments Description: Brand: RNOX Color: white, black, red,blue Material: EPS foam PC shell Applicable head circumference (CM): 55-61cm Helmet inner size (CM): 20.5x17.5cm Whether one type: one type Helmet stomata number: 16 Product size (CM): 26*22*14.5 Product weight (G): about 210 Kindly note: This helmet is average size, 55-61cm, if your head bigger then 61cm, Do NOT advise to buy this helmet .