The best replacement for helmet is no helmet.

The best alternatives to helmet are rated as following:
★★★★★  no helmet
★★★  helmet
★★★  anteater
★★  leaf guard
★★  hard hat
★  antelope
★  full face helmet
★  full face
★  helm
★  doc band
★  beanie
★  skateboard helmet
★  chest mount
★  skivvy
★  half helmet
  bike helmet
  201
  revolution helmet
  mike
  turban
  street bike helmet
  half
  aero wheels
  full helmet
  motorcycle helmet
  road bike helmet
  giro
  riddell helmet
  hood
  bicycle helmet
  3\/4 helmet
  boonie
  hardhat
  mtb helmet
  simpson helmet
  bike riding helmet
  mich
  3 4 helmet
  no helmet motorcycle
  gutter topper
  agv blade multi helmet
  gutter guard

Your alternative for helmet is not listed? Suggest!
Speaking about helmet, one probably shouldn't forget about intercom.

Other search terms related to helmet and their ratings are:
★★★★★ intercom
★★★★ goggles
★★ headset
★★ accident
★ sound blaster
You have in mind a companion for helmet and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of helmet in all years. Click on graph for more.
helmet
no helmet
helmet