Safety and comfort: The Alpina MTB 17 cycling helmet offers proven and functional head protection while riding. It's made of Hi-EPS material with an in-mold construction to provide the user with the highest possible level of protection. The helmet features 23 vents for maximum breathability on hot days. The convenient Custom Fit System allows for quick and comfortable adjustment to your head shape. The front vents are covered with Fly Net, which prevents insects from getting under the helmet shell. Vents: 23 VENTS Construction: IN-MOLD TEC Material: HI-EPS Shell: CERAMIC SHELL Adjustment: RUN SYSTEM CLASSIC Straps: Y-CLIP Fastener: ERGOMATIC Extras: FLY NET Visor: SHIELD PROTECT Weight: 292 g Safety: CERAMIC EN 1078 CERAMIC SHELL - All Alpina helmets manufactured using the InMold process are equipped with a robust ceramic shell. A polycarbonate plate is stretched under high temperature into the shape of the helmet and pressed against the Hi-EPS shell under high pressure and then thermally fused. The ceramic shell offers several features: it is impact and scratch resistant, UV resistant, and antistatic. Hi EPS - The inner shell of all Alpina helmets is made of Hi-EPS (High Expanded Polystyrene). The material contains microscopically small air chambers that absorb the forces acting on the helmet in the event of an impact. Hi-EPS provides optimal protection while also allowing for a very thin helmet wall and a narrow helmet shape.