A large part of the helmet is made from recycled EPS materials with 20% cork AVID Progressive EPS - A mix of different density EPS ensures that both strong and light impacts are optimally absorbed. At the same time, the material remains light and allows for optimal ventilation In-Mold shell construction Clear visor Click-to-Fit system - Height-adjustable adjustment system Webbing and padding - 100% recycled polyester Ventilation - 13 openings ensure optimal ventilation Weight: 380 g (size M) Type Article Area of use City / Trekking Colour name matte cool grey Gender Adult Main colour grey Head circumference 52 cm , 53 cm , 54 cm , 55 cm Head circumference up to 55 cm Head circumference from 52 cm Closure system Plug-in buckle Adjustment system Click-to-Fit Visor fixed