The best replacement for hard hat is bump cap.

The best alternatives to hard hat are rated as following:
★★★★★  bump cap
★★★  helmet
★★★  turban
★★  climbing helmet
★★  eps
★★  ionbond
  bump hat
  hard hat
  hardhat

Your alternative for hard hat is not listed? Suggest!
Speaking about hard hat, one probably shouldn't forget about face shield.

Other search terms related to hard hat and their ratings are:
★★★★★ face shield
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hard hat
bump cap
helmet