The BAKFlip MX4 TS is BAK's Gen 3 MX4 hard folding cover with T-slot channels built into both side rails, so racks, cargo holders, tents and crossbars (sold separately) can mount above the cover while the bed stays locked below. The aluminum panels have high-density polymer cores that BAK rates 22% stronger than the original MX4, BAK's Multi-Shield matte black finish resists scratches and UV, and the patented auto-latch locks it as it closes. BAK makes it in truck-specific versions, each cut for one bed length and, on some trucks, one bed option such as Toyota's deck rail system. Every version is rated at 400 lb spread evenly, clamps on with no drilling on most trucks and carries BAK's 5-year limited warranty.