Extang 2.0 Solid Fold Tonneau cover. I took this off my 2021 Ford F150 Super Crew with 5'7" bed. This cover goes on/off easily in about five minutes with thumb screws. No rails to attach. I believe the cover is rated to hold 600 pounds. You can easily stand on it without damage. Excellent condition. I only took it off to install a camper shell. You can read about them here: https://extang.com/solid-fold-2-0/2021/ford/f-150