Traditional chest and back armor is cumbersome. Made for the off road and dirt jumping crowd, the Alpinestars S-MX 2 bionic protection jacket is the easiest, most useful piece of armor you can wear. Back, shoulder, chest, elbow and kidney protection, rolled into one piece of equipment. On the left side of the chest, you’ll find a zipper. Alpinestars did this to keep the chest protector in one piece while allowing for easy entry into the jacket. Don’t grab four individual pieces of armor, grab your S-MX 2 jacket and ride out.