G-Form XRD Shin Pads with Reactive Protection Technology - XS (Sold as a Pair) The G-Form Shin Pads provide form fitting protection for all day excursions out on the trails. G-Form uses RPT - Reactive Protection Technology, a blend of Poron XRD and proprietary G-Form materials and technology. RPT give you a protective material that is progressive, meaning it gets tougher as the impact increases. It will also keep protecting you after repeated impacts without losing any of its protective qualities. RPT Technology in the G-Form Shin Guard also keeps the guard light and comfortable.