Helmet goggles are usually worn over the helmet. For practical reasons, jet helmets are the most common choice. Most helmets have an adjustable (wide) elastic strap and, in general, suitable helmets also have some means for securing or attaching these elastic bands.
However, this does not necessarily have to be the case, as there are also helmet goggles that fit inside your helmet.
What both have in common is that this type of goggles offers the best possible protection against the most diverse conditions on a motorcycle. Sun, wind, rain, unwanted objects, insects ... a good, clear image is always guaranteed.
Additionally: helmet goggles by nature look a bit old school and various models are therefore deliberately given a cool, vintage, retro, café-racer look.