welcome to our shop! Size: S: 54-55cm, M: 56-57cm, L: 58-59cm, XL: 60-61cm Color as shown Packing: 1*helmet Helmet size tips: (1) Wrap the head about half an inch above the eyebrows with a tape measure (2) Perform 2 to 3 measurements to select the largest one feature: 1. The helmet shell is made of high-quality ABS material, which is light in weight and resistant to fall 2. Specially designed for motorcyclists with good air permeability