Knight locomotive motorcycle helmet four seasons universal bluetooth thermal helmet riding full helmet

Material: ABS Applicable people: general purpose Specifications: M-57-58-head circumference, L-59-60-head circumference, XL-61-62-head circumference, 2XL-63-64-head circumference, 3XL65-66-head circumference, S-55-56-head circumference Applicable season: universal in all seasons