<b> MOTORCYCLE SCOOTER OPEN FACE HELMET</b> <br> <br> Size Chart <br> - Small: 21.7 – 22 In / 55-56 cm <br> - Medium: 22.4 – 22.8 In / 57-58 cm <br> - Large: 23.2 – 23.6 In / 59-60 cm <br> - XL: 24 – 24.4 In / 61-62 cm <br> - XXL: 24.8 – 25.2 In / 63-64 cm *Some variance occurs, even between different models from the same manufacturer, which is why we offer a "no questions asked" return program. If your helmet does not fit properly, just send the helmet back to us for a full refund.