The BAKFlip MX4 is constructed entirely from alloy materials, including heavy-duty aluminum top panels and side rails. Unlike soft-folding tonneau covers, the MX4’s robust aluminum construction resists cuts and slashes, preventing thieves from damaging the bed cover or accessing your valuables. The BAKFlip MX4 also employs BAK’s patented auto-latching side rails, which automatically lock the MX4’s panels to prevent thieves from prying at the cover’s sides for entry into the bed. No matter the cargo you’re transporting, you can rest assured knowing your gear's backed by the premium protection of a BAK truck bed cover.