Arai 55054477

To upgrade or downgrade the lining of your Arai helmet, you can order the lining in different strengths. Please, take the standard strengths of your helmet from the following table: Head circumference in cm Helmet size Tighten Standard Looser 54 XS 35 mm 30 mm 25 mm 20 mm 15 mm 55-56 S 35 mm 30 mm 25 mm 20 mm 15 mm 12 mm 57-58 M 35 mm 30 mm 25 mm 20 mm 15 mm 12 mm 59-60 L 35 mm 30 mm 25 mm 20 mm 15 mm 12 mm 61-62 XL 35 mm 30 mm 25 mm 20 mm 15 mm 12 mm 63-64 XXL 30 mm 25 mm 20 mm 15 mm 12 mm for Tour-X 4 100% polyester easily cleaned