Then why don&#x27;t you wear a helmet when you&#x27;re walking on ice as well?<p>I&#x27;m not saying helmets don&#x27;t work, I&#x27;m saying it&#x27;s not very likely to hit your head at high velocity on the ground if you were going 10 km&#x2F;h. And if that means you&#x27;re not gonna ride a bike at all because you forgot your helmet you&#x27;re probably having a higher risk of cardiovascular disease further down the line than you have of breaking your head now.