It definitely holds your full face helmet in place.
I have not received the item, therefore my experience is not applicable. I will say however that if the item does not get delivered then my experience will be very negative and I will go out of my way to let many know.
Overall the strap works very poorly. It is great in elasticity and strength, but in order for it to work appropriately, it has to be extremely tight. Almost lost an expensive helmet because of it.
These straps, with the ability to spread to steady the load on my bike, are just what I needed for an upcoming Sturgis Trip. I didn’t want to use multiple bungee cords/straps to secure my camping gear on my bike. With the straps I only have to use one To hold what I need to carry.
Works good and is constructed very well