Just to be clear to the OP, regardless of what your email says or doesn't say, the rules for track days are:
Helmets must be car helmets
Helmets must be certified for use (most places now site Snell 2005+)
Helmets must be full face for use in a convertible car
Now, to what extend these rules apply varies. I have never seen any TDO check the certification of helmets. I've also never seen Motorbike helmets be an issue (they are usually very easy to spot as they come with colorful graphics). However the open face restriction to closed cars only is nearly always enforced.
What you have linked too is a scooter helmet. It fails all of the rules, so don't be surprised if you get pulled up for it. A full face helmet 'looks' far more acceptable, so if you want to cheap it out, go for a cheap full face bike helmet.
Helmets must be car helmets
Helmets must be certified for use (most places now site Snell 2005+)
Helmets must be full face for use in a convertible car
Now, to what extend these rules apply varies. I have never seen any TDO check the certification of helmets. I've also never seen Motorbike helmets be an issue (they are usually very easy to spot as they come with colorful graphics). However the open face restriction to closed cars only is nearly always enforced.
What you have linked too is a scooter helmet. It fails all of the rules, so don't be surprised if you get pulled up for it. A full face helmet 'looks' far more acceptable, so if you want to cheap it out, go for a cheap full face bike helmet.