♦ The helmet is light and convenient, comfortable to wear, wide field of vision, cool head, provides a comfortable driving experience, not only can protect the head, but also can reduce the impact of high speed on the eyes. Durable and impact resistant , ideally suited to the shape of your head. Name: Retro motorcycle half helmet Material: ABS Unit weight: Around 500g Size: M: 57-58cm/22.4-22.8 in L: 59-60cm/22.8-23.6 in XL: 61-62cm/24-24.4 in Certification: DOT Safety Certification Applicable season: four seasons Applicable people: adult Applicable gender: unisex Style: Half Helmet, Vehicle service type: motorcycle, street car, scooter, outdoor adventure, off-road vehicle, snowmobile, cruiser, etc. Features: With hidden sunglasses, with face mask, detachable brim Removable, fully washable lining. Fully airy design. High quality ABS. Quick release of the chin strap. Adjustable eyewear system. HELMET SIZING CHART AND MEASURING TIPS: If your head measurement is between two different sizes on the helmet size chart, if you like the head and helmet close to each other, take the smaller size, if you like it looser, take the larger size The yardage of one point.