Door Bag with Knee Pad for Polaris RZR, Rear Driver Side, Blue Provides a protective knee pad and much needed storage; Attaches to stock RZR door using factory screws; Made with durable, marine-grade vinyl; Backed with tear-resistant vinyl-coated nylon PRP PRP Door Bag with Knee Pad, Rear Driver Side, Blue - E40-V E40-V UTV Storage