ABS plastic takes a beating better than kneecaps and shinbones do. Together, knee and shin protection, knock away debris kicked up from the trail or track and distribute the force of the impact over a wider area, reducing the chance of injury. ABS plastic wraps to the side of the knee and shin area. Two large Velcro straps secure the guard in place. Rider protection begins with simple gear, like Flex Knee Shin Guards, to avoid injuries.