Helmet size 56 58cm there are an amazing 21 air vents for maximum cooling including 8 rear a uni size adjustment headlock system at the rear of the helmet allows you to make the helmet the perfect fit yourself the helmet includes a padded chin strap buckle protector for a comfortable fit around your chin the helmet has a mesh liner over the front ventilation holes to protect from wasp and bee stings the helmet also includes a visor the helmet is tuv tested and conforms to en 1078 standa