“Other” include instrumentation, simulators (for instructors), harness add-ons, helmets, videos, books, etc.
Reserves are under Reviews: Safety Gear
Regarding helmets: they protect both the pilot’s computer and ears. They should be comfortable and provide good sound attenuation while allowing radio communications. The latter grieves the designers more than anything, it seems, since there are so many radios with equally varied connectors. Rarely do standards exist. Aviation radios are all pretty standardized but few paramotor pilots use them. That’s understandable since they’re expensive and there’s really only one frequency for air-to-air communications: 122.75 Mhz.