Suomy GT-R Chrono / Triathlon / TT Helmet The following is quoted: Among the GT-R series, this helmet features a simple matte finish color scheme, making it suitable for everyone. It distinguishes itself from typical single-color racing helmets with SUOMY's signature graphics. The GT-R was born from years of experience in the motorcycle helmet field. SUOMY aimed to create a lightweight, compact, and breathable matte-finished helmet through wind tunnel research on product aerodynamics. The wind flows smoothly over the matte finish. This special SUOMY paint is superior to conventional gloss paints. It's an ideal product for triathlons, meticulously designed with an analysis of airflow down to the smallest details. Size: 54-60 XS-XL (One Size) Adjustable with a dial I had trouble finding an aero helmet that fit my head, but this one was easily adjustable, so I had no problems using it. I used it in triathlon races. Used about 3 or 4 times. The condition is relatively clean. There are some scratches on the visor. One of the central fixing points of the visor broke off when detaching it. It's fixed at both ends, so there's no problem with use. Please consider repairing it with adhesive, or refrain from purchasing if you are concerned. Of course, it can also be used with the visor completely removed. A dedicated bag is also included. TT bike Time trial Triathlon Road bike Bicycle TT helmet Aero helmet