Skull Crossbones Rhinestone Helmet Patch
The directions are so simple: just peel off the back to stick on your helmet. The special commercial grade adhesive allows you to apply and remove the patch for repositioning if necessary. (Unlike some stickers that would be ruined if you tried to reposition them.) The bond becomes stronger with time so it is not advisable to try to reposition the patch after it has been on for a day or more.
Once you have found a good spot for the rhinestone patch, simply apply pressure and rub it down. It will stay on at any speed. These patches are very durable and will withstand extreme temperatures and wet weather.