My husband, for this helmet was determined, is happy with the helmet. What is like him on the helmet the variable size. One can the helmet of the Gr. 58 to 62 set. This is done with a small wheel, which is mounted at about neck level. By turning two plastic straps, coming from the left and right, then overlapping, excited by bike, or further provided. But the knob has it all, because under a plastic disc are four tiny red LEDs mounted squarely. By pressing once on the button center the diodes light up permanently, after repeated pressing them blink. An additional pressure on the diode again. The helmet has the top and rear air vents, which can be opened individually the upper vents on sliders and close. From the appearance of her helmet makes a tasteful and unobtrusive impression of what my husband likes very much.