Helmet Size Chart M 22.4 to 22.8 (57-58cm) L 22.9 to 23.6 (59-60cm) XL 23.7 to 24.4 (61-62cm) XXL 24.5 to 25.2 (63-64cm) Helmet Size Tips (1)Wrap a measuring tape around your head about a half-inch above eyebrows (2)Take measurement two to three times to pick the largest one. Flip-up Helmet & Removable Inner Pads Press the button covered by chin curtain and you will have a flip-up helmet. You could remove and clean the inner pads if necessary. Vents Open the vents and ventilate the helmet. The vents on the front and top of the helmet can be closed. With the chin bar in the closed position the performance is that of a full face helmet thanks to the streamlined chin guard perfectly integrated into the lines of the shell. Legal Disclaimer Please Kindly See Size Chart Before Placing Orders.