I would NOT get an M certified helemt for auto use. Get an SA rated helmet.
There is a difference in how they test impact ratings for the different ratings. M helmets are for single impact and sliding. SA helmets for multiple impacts (head moving around in car).
Als SA rated helmets use fire resistant/retardant materials.
For autocross, it is not a big deal, for track days it is.
Also many track days will not allow M rated helemts, so buy the right one first and not have to do it again.
There is a difference in how they test impact ratings for the different ratings. M helmets are for single impact and sliding. SA helmets for multiple impacts (head moving around in car).
Als SA rated helmets use fire resistant/retardant materials.
For autocross, it is not a big deal, for track days it is.
Also many track days will not allow M rated helemts, so buy the right one first and not have to do it again.
