5 various types of helmets: martial arts helmet, hard hat, bike, ski, and motorcycle helmet. Photo was taken in Denver, Colorado, USA.
<a href="//commons.wikimedia.org/w/index.php?title=User:Brandenads&amp;action=edit&amp;redlink=1" class="new" title="User:Brandenads (page does not exist)">Brandenads</a>
2020-09-30
<span class="int-own-work" lang="en">Own work</span>