Rear fender (Hager) - This is the rear fender of the motorcycle, installed for additional protection from dirt. Moreover, most often, they try to protect the rear shock absorbers of the bike with a similar body element.
You can create such a fender liner for your motorcycle using PVC of a certain thickness and reinforced strength. It is this material that will not complicate you with significant costs and is quite common. Nevertheless, it also has significant drawbacks. First of all, they consist in primitive aesthetics and low strength.
For those looking for ways to create a very durable hager on a bike, carbon and Kevlar are the way to go. These modern materials are often used for military purposes. This is how helmets for soldiers are made from Kevlar. The lightness and durability of this basic component of the warriors' equipment has been tested in practice many times.