This 'little brother' of the B'Twin Aerofit 900 borrows from its aerodynamic design. It has three wide ventilation openings and a simple wheel-turn adjustment system for the right fit. Design benefits: Ventilation 3 wide forehead ventilation openings to suffer less from the heat. Weight A light, compact helmet, 240 g in size M. Easy dressing HALF Turn-Ring system to quickly adjust the helmet to your head. Stay cool and comfortable on your rides with the RoadR 100 Cycling Helmet. Featuring three wide forehead ventilation openings, this lightweight helmet (only 240 g in size M) helps reduce heat build-up, while the HALF Turn-Ring system allows for quick and easy adjustments for a secure fit. Enjoy your cycling experience with confidence and comfort.