WeatherTech 421857IMSK SeatBack Cargo Liner HP with Bumper Protector Grey

The WeatherTech 421857IMSK SeatBack Cargo Liner HP with Bumper Protector delivers complete, custom-fit cargo area protection in Grey for select 2025–2027 Buick, Chevrolet, and GMC SUVs. Engineered from the same high-performance thermoplastic elastomer (TPE) material as the popular FloorLiner HP, this one-piece cargo mat shields both the floor of the cargo area and the backs of the rear seats from spills, dirt, mud, pet hair, and everyday debris.

A patent-pending expandable accordion hinge is the standout engineering feature, allowing the liner to maintain full, uninterrupted coverage whether your rear seats are upright or folded completely flat — no gaps, no exposed carpet. An integrated water retention ribbing system channels and traps moisture, while non-slip nibs on the underside and hook fasteners keep the mat firmly in place on both the floor and seat backs.

Key Features:

• Grey (IM) color — blends with factory interior trim
• Bumper Protector included — guards the rear bumper and liftgate sill from scratches and scuffs during loading and unloading
• Patent-pending accordion hinge — maintains coverage when rear seats are in the full-down position
• Water retention ribbing system — traps and contains liquids to prevent carpet damage
• Non-slip underside nibs and hook fasteners — keeps liner securely positioned on floor and seat backs
• Trimmable ISOFIX cutouts — accommodates child safety seat anchors without removing the liner
• Thermoplastic elastomer (TPE) construction — flexible, durable, and weather-resistant; won't crack or harden in extreme temperatures
• Free of latex, PVCs, cadmium, and lead — 100% recyclable and eco-conscious
• Made in the USA — manufactured at WeatherTech's American facility
• Easy installation and removal — one-piece design allows for quick cleanup

The SeatBack Cargo Liner HP is custom laser-measured for a precise, vehicle-specific fit, ensuring full coverage of the cargo floor and rear seat backs. The included bumper protector adds an extra layer of defense to the rear bumper loading edge, protecting your vehicle's exterior finish every time cargo is loaded or unloaded.