The Mistrall-2 Edition is made of a beautiful scratch-resistant material in the center of the helmet and provides fan-shaped air vents for first-class ventilation. • More security due to the extended downward rear part that includes full micro-shell coverage • Changeable CASCO color laces (reflective). Optional: MyStyle finished with Swarovski® crystals The size of the HV Polo helmets corresponds to the circumference of your head (forehead), in cm.