Helmets in particular have tremendous specificity, which is fascinating. Bicycle, ski, and motorcycle helmets have MIPS. Motorcycle helmets have chin guards. Bicycle helmets have side impact protection. Climbing helmets have puncture resistance and top impact protection. Ski helmets have puncture resistance and coverage close to a motorcycle helmet, but less cushion. I’m sure the list is long for hard hats as well.

Kids helmets have started to show up with breakaway neck straps- the strap only need be so strong to prevent the helmet from slipping off in a crash.