2021 GMC Sierra 5'8" Short Bed Hard Folding Tonneau Cover

Premium Low Profile Aluminum Truck Bed Cover

The 2021 Sierra 1500 — Refreshed Interior, Same Proven Bed Architecture

The 2021 GMC Sierra 1500 brought a significant mid-cycle update — a fully redesigned interior with an available 13.4-inch diagonal infotainment screen, updated driver assistance technology, and expanded AT4 availability. The 2021 update solidified the Sierra's reputation as the premium-oriented alternative in the half-ton segment. The bed architecture introduced in 2019 carried through unchanged.

Thunder Armor is designed, engineered, sourced, and manufactured in the United States by Thunderstone Manufacturing. Premium-grade aluminum. Best-in-class low-profile design. Enhanced theft protection with a secure latch design. All-weather protection. No-drill installation. A 5-year limited warranty from an American manufacturer. Fitment confirmed for the 2021 GMC Sierra 1500 5'8" Short Bed. In stock and ready to ship today.

Thunder Armor Features & Benefits

• Made in America

  Proudly designed, engineered, sourced, and manufactured in the United States. True American craftsmanship in every detail.

• Heavy-Duty

  Made from premium-grade aluminum, built to last and provide years of reliable protection against the toughest conditions.

• Best-in-Class Low-Profile Design

  Engineered for a precision fit, Thunder Armor achieves a best-in-class low-profile design that sits virtually flush with your truck bed.

• Enhanced Theft Protection

  Durable aluminum construction and secure latch design provide reliable defense against theft and unauthorized access.

• Weather Resistance

  Keep your cargo dry and safe from rain, snow, and extreme temperatures with our robust all-weather design.

• Rear View Visibility

  A clean, flush look that maintains rear window visibility and maximizes your truck bed's usable space.

• Quick & Easy Installation

  Install your tonneau cover in just 30 minutes. Minimal tools required.

• Instant Availability

  In stock and ready to ship today.