They are not necessary but are a good idea. A head shot that would knock you out, might only leave you dazed. No helmet in the world is going to protect you if you hit a tree at 30mph or land on your head after a huge air. Still, they can reduce injuries. Several of which you might get in the park. I wear one all the time and mostly ride backcountry. You never know what is under the snow in the bc and a roll could run you right through rocks. So a helmet is a little extra insurance just in case.
Find one that fits you well and that you like. Helmets are way better for warmth than a hat. You'll be amazed. Also if you are into tree riding, a helmet will allow you to take it to the next level. Goggles and hats getting ripped off by close in tree branches don't happen. You can even use the helment to know branches out of your way. Very nice...
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