Speaking from over 44 years of riding, both on and off road, nothing more then a cut arm and skinned thigh, any leather jacket is better then none. That goes for long pants and boots also. Don't ever wear nylon. A friend of mine went down in Texas back in the 70s, wearing a nylon wind braker, it melted into his wounds, the nurse had to pick it out with tweezers and no pain killer! Tried to count how many bike I have had, lost count, only have nine right now!