Pair included in the price. HIGH DENSITY HARDSHELL: This hardshell is the result of countless CAD drawings and engineering meetings. The material is light weight, and has an impact modifier to absorb force while retaining its shape. A carefully engineered matrix on the back of the shell further distributes impact forces across the hardshell and foam. KNEE STABILIZATION PAD: Centers the knee to ensure proper armor placement and minimizes armor movement.control. We spec premium closed cell foam in the arms and legs. While it is more expensive, it is the only type of foam we've found that will not "thin out" over time.