Constructed of rugged HDPE (High Density Polyethylene) materialChemical, mar, scratch and fade resistantFully modular (customer can add/remove pieces unlike the traditional 1-piece design)Follows the sheet metal very closely (more so than traditional 1-piece designs) which helps maximize usable volumeExcellent impact protectionCompatible with most bed accessories offered by Ford like cargo rails, storage boxes, bed/tonneau covers, eDIY switch, swing case, etc