Just felt like chiming in on this one. A knee bolster is a great assett if it truely is impact absorbing as it's meant to prevent damage to the femoral arteries in your legs via broken bones. It's somewhat common for someone to badly fracture their femur and subsequently puncture or tear their femoral artery which can cause you to bleed to death faster than most EMT's will be able to respond or transport you to the hospital.

Fact.