Typically the standard biker leather jacket is made up of cowhide 122 1.2 – 1.3 millimeters in thickness and is stitched with a Coach nylon filament wrapped in Cotton stitching which is often used in parachutes to strengthen the seams and hold the seat together for when you go down often these biker leather jackets will not have the armor in the elbows and shoulders and are purely used for reducing Road Rash when you go down on the bike although effective for helping against Road Rash they do little to help in high Collision high-speed fall with your elbows joints and shoulder also these biker leather jackets seldom have back protectors or chest protectors