What differences do expensive helmets make?

I don't have a motorcycle but to ride as a passenger my friend said I need a helmet and he'll pick me up for work,I found some helmets for $80 and some up to $1,000 so what difference does it really makeDo more expensive ones have special gimmicks and/or do they all get the job done? via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/gb9zzx/what_differences_do_expensive_helmets_make/?utm_source=ifttt