Designed for anyone interested in riding a bike. Protection plus ventilation. This essential helmet (available in two sizes), offers excellent ventilation. Designed for anyone interested in riding a bike. Protection plus ventilation. This essential helmet (available in two sizes) offers excellent ventilation. Ventilation 19 vents Lightweight 240 g in size M. Ease of use Adjustable chin strap with sliders. Designed for anyone interested in riding a bike. Protection plus ventilation. Ventilation 19 vents Lightweight 240 g in size M. Ease of use Adjustable chin strap with sliders.