46 CFR §160.174-23

1. (a)Each thermal protective aid must be marked with the words “Thermal Protective Aid,” the name of the manufacturer, the model, the date of manufacture or a lot number from which the date of manufacture may be determined, and the Coast Guard approval number.
2. (b)Each storage case must be marked with the words “Thermal Protective Aid” or the thermal protective aid must have a similar marking which is visible through a transparent storage case.