The gear must comply to safety standards so they must meet the label required the race group requires so all gear if its a helmet down to the shoes must have a label with the grade you need.

So if the race group requires a minimum SA95 helmet it must have a label meeting or exceeding that

If Nomex is required make sure the vendor states that and if multilayer is required then also the vendor should state that so you do not end up buying a single layer product by mistake.

Always when getting the product you check the label and any date codes if has for some groups may state the gear cannot be older then X years.