This is a helmet from the outdoor brand Mammut. The size is 52-57cm. The size can be adjusted with the rear belt. Purchased for mountain climbing. Used 5-6 times. I took care of it after use, but there is a feeling of use, and there are some slightly yellowish areas. Please check the photos 15 and 16. It is still in good condition and can be used for a long time. Please consider purchasing if you understand that this is a used item. m(_ _)m #Kurihara Sports Modern design hard shell, innovative 2K-EPS core for maximum absorption, 12 openings for maximum comfort, ergonomic, comfortable padded interior Super lightweight and easy-to-adjust headband for an immediate fit Height and size adjustable headband Versatile and perfectly adjustable chin strap, 4 headlamp clips #Kurihara Sports 【Color】 White 【Size】 MAMMUT Mammut El Cap white-iron El Cap Climbing Bouldering Helmet Bike Bicycle Disaster Prevention ■Please understand that this is a used item before considering purchasing. ■We will ship it as compactly as possible. Thank you for your understanding. ★I am also selling other sporting goods, so please take a look!