This is a Trek Bicycle helmet. It's a helmet that uses the latest "WaveCel" technology to prevent head injuries from falls, etc. The retail price is 18,900 yen. It's been over a year since I bought it, but it's still in good working condition. I'm selling it because I wanted a change of pace and bought a different helmet. It has a fair amount of wear and tear, with small scratches and marks, so I recommend that those who are concerned refrain from purchasing. The helmet pad has a small tear in the stitching on the edge (please check the photos). See below for product details: https://x.gd/F1ZXF Size: M/L size 55-61cm Purchase date: July 2024