I also mountain bike and recently got a Giro Havoc. It's a fantastic helmet! Why did I get a new helmet? Because I crashed and hit my head hard on a hard-packed trail in my old helmet. If I hadn't been wearing a helmet, I could have ended up with a concussion or worse. PLEASE, run, don't walk, to get yourself a helmet ASAP! Your brain is way, way to important to risk. One crash is all it takes to ruin your life....

Sorry to be alarmist, but I feel strongly about this one!

Emily