Helmet Ventilation Liner (Silicone Inner Pad) Can be attached to motorcycle and bicycle helmets. I bought it because I didn't want my hair to get flattened, but I'm selling my motorcycle, so I only tried it on and it's unused. Therefore, I don't know how effective it is. I bought it on Amazon for 1580 yen, so I'm selling it for less than that. Since it's a used item, please purchase it if you understand. (Manufacturer's Description) Creates a physical space between the helmet and the scalp, generating airflow inside the helmet, which helps to keep your style and prevents your hairstyle from being ruined. Thank you for looking.