If you break your helmet during a crash and it was made by Trek, they will replace it free in the first year! (-: I've broken two and had one replaced free.

Crashes are scary though. I'll save you the stories but one was head first (broken teeth and possible broken neck = ambulance ride to hospital), the second was broken ribs and head hitting pavement like it was the end of a wipe. I rode the 6 remaining miles back to the trail head. Then 3 months rehab from ribs and butt bone damage.

Both crashes occurred in an instant. I had a couple other ones but no harm; no foul!
6 years marines here................