Knee Pads for Polaris RZR with Door Speakers Pair PRP SeatsPRP's Knee Pads for the Polaris RZR With Door Speakers are a must have to get the most comfort out of your ride. A lot of newer model RZR's are coming speakers built into the upper doors (that can't fit our standard RZR door bag). So we created these knee pads to still give you the comfort that you need on long rides. The pads are just thick enough to stop your knees from hitting the doors. Both attach securely to the door by using J clips, and a hook