The light and very comfortable Bollé TRACKDOWN MIPS MTB helmet (55-59 CM) will protect you even better thanks to its MIPS technology. In the event of an angle impact, the movable MIPS® insert inside the helmet will allow a slight movement against the helmet shell, thus absorbing rotational forces. The result is a significant reduction in these forces which would be transmitted to the brain. The sise can be adjusted using a 360 ° system around the entire circumference of the head with the option of vertical adjustment. Fifteen vents ensure perfect air circulation, reducing the possibility of sweating inside the helmet.