Here you can buy helmets and accessories for motorsport. You will find i.a. bags for helmets and HANS neck collars as well which is a protection against neck injuries. A helmet is used in motorsport to protect the head and brain from impact in the event of a collision. The construction of a helmet is made of a thin, hard outer shell made of polycarbonate plastic, fiberglass, or kevlar. Inside there is a thick soft layer made of expanded polystyrene or polypropylene "EPS" foam.Helmet Homologization - FIA | Snell
A motorsport helmet must meet one or both of the sets of rules in order to be homologated and therefore approved for use at one or more motorsport events. FIA standards are most prevalent in Europe and most countries outside the United States. In Denmark, FIA approved helmets are often enough to be able to participate in all kinds of motorsport. However, there are different types of approval, have the motorsport you have to participate in, special requirements for helmets and HANS, you need to research this before. Helmets that are FIA approved have been tested in special test houses to meet the FIA requirements, it is not always an easy task for the manufacturer and therefore the FIA is the only recognized motorsport standard used in Europe.
Helmets do not just get too old. Helmets do not have an expiration year, but homologations eventually become too old, but it often takes 10-15 years.