2020-2026 GMC Sierra 3500 HD Floor Liners|Double Cab Models (OTH w/ rear under-seat storage)|SMARTLINER

SmartCoverage™ Custom Fit Floor Liners for the 2020-2026 GMC Sierra 3500 HD (Double Cab Models (OTH w/ rear under-seat storage)) is purpose-built, not trimmed down from a universal mat. Every contour is laser-measured against your Sierra 3500 HD’s own floor, so the fit is exact — right down to factory mounting points — and the waterproof, stain-resistant TPE construction stands up to whatever the cabin sees next.

Why You’ll Love It

• Exact-Fit Engineering — every edge is measured against your cabin’s real dimensions, so there are no awkward gaps or overlaps
• Stable, Rattle-Free Fit — grips the floor instead of sliding, so it stays exactly where you put it
• Weatherproof by Design — waterproof, stain-resistant TPE resists staining and won’t break down from repeated exposure to moisture and road salt
• Odorless & Non-Toxic — BPA-free materials with no off-gassing or chemical smell
• Effortless Cleanup — lift it out and rinse with a hose for a like-new finish in minutes
• Confidence Built In — a Limited Lifetime Warranty stands behind every set

Every dimension here traces back to the Sierra 3500 HD’s actual floor layout. Whether you’re working with the Gasoline version and the Double Cab configuration, this set covers 2 Row Floor Liners with 1st Row Over The Hump Coverage, Second Row Liner, and Second Row Full Coverage Liner. Comes in Black to blend right in.