The HIWOLF PRX4 tonneau cover has two prominent positions: Folded down to a third, giving you access to your truck bed for transporting large items. Opened the surface, and locks into place with quick lock clamps to protect your cargo from the weather and sticky-fingered bandits. The PRX4 is the upgrade to the HIWOLF FRP series. PRX4's panels offer improved scratch, dent, and ding resistance compared to aluminum panels. Keep away from denting, cracking, warping, fading, rusting, and corrosion, because this thing boasts an FRP top, leak-proof rubber seals and EPDM rubber hinges that are made to outlast your truck. PRX4 can isolate more than 98% of rainwater, it certainly won't let you down the next time you need to haul cargo during a sudden downpour. But perhaps the most outstanding quality of the HIWOLF PRX4 truck bed is can handle a load rating of 509 lbs. No would-be thieves are getting through that deck any time soon.