The RUPES BigFoot Backing Plate forms a critical part of the BigFoot Random Orbital Polishing System and is currently available in three sizes, with each size being designed for a specific subset of BigFoot machines (see the fitting notes in the How To Use section below). All three sizes are made out of nylon and flexible polyurethane, which together are particularly resistant to mechanical stress. Furthermore, they are all engineered to meet a specific weight target, which ensures that they work in perfect harmony with the counterbalance in the machines they are intended to be fitted to. This approach, which is also used for the full range of BigFoot polishing pads, ensures that the balance of each machine is optimised and that vibration levels are minimised. The carefully positioned ventilation holes in each size variant create an airflow pathway that dissipates frictional heat and helps to maintain safe working temperatures, even on relatively sensitive substrates such as aluminium and carbon fibre. The hook and loop fastening material used for all three size variants is specifically designed to be able to withstand the extreme lateral forces generated by long-throw dual action polishers, and provide solid anchoring and exceptional pad stability while each machine is in use. The amount of vertical grip, however, is normal, thus ensuring that BigFoot polishing pads remain easy to affix and remove.