2021 GMC UnderCover Parts
Choose a Model for your 2021 GMC
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Product
Price
- Triad 2019-23 GM 6.5ft
- CarbonPro Bed: Without CarbonPro Bed
- 19-2023 Silverado/Sierra 6.5 Bed
- Product Attributes:
- WARNING CA Proposition 65: Yes
- Paintable: No
- WARNING CA Proposition 65 Message: Cancer And Reproductive
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
-
Features:
- Fashionable Matte Black Panels
- Easy On-Off Functionality
- Integrated Perimeter And Corner Seals
- Dual Hinge Seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2021 - GMC Sierra 1500 | United States | 79.4 |
- Triad 19-23 GM HD 6.9ft
- 20-2023 Silverado/Sierra HD 6.9 Bed
- Product Attributes:
- WARNING CA Proposition 65: Yes
- Paintable: No
- WARNING CA Proposition 65 Message: Cancer And Reproductive
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
-
Features:
- Fashionable Matte Black Panels
- Easy On-Off Functionality
- Integrated Perimeter And Corner Seals
- Dual Hinge Seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2021 - GMC Sierra 3500 HD | United States | 82.2 |
- Triad 15-22 col/can 5ft
- 15-22 Canyon/Colorado 5 ft
- Product Attributes:
- WARNING CA Proposition 65: Yes
- Paintable: No
- WARNING CA Proposition 65 Message: Cancer And Reproductive
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
-
Features:
- Fashionable Matte Black Panels
- Easy On-Off Functionality
- Integrated Perimeter And Corner Seals
- Dual Hinge Seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2021 - GMC Canyon | United States | 61.7 |
- Triad 15-22 col/can 6ft
- 15-22 Canyon/Colorado 6 ft
- Product Attributes:
- WARNING CA Proposition 65: Yes
- Paintable: No
- WARNING CA Proposition 65 Message: Cancer And Reproductive
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
-
Features:
- Fashionable Matte Black Panels
- Easy On-Off Functionality
- Integrated Perimeter And Corner Seals
- Dual Hinge Seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2021 - GMC Canyon | United States | 74.0 |
- Triad 2019-23 GM 5.8ft
- CarbonPro Bed: Without CarbonPro Bed
- 19-2023 Silverado/Sierra 5.8 Bed
- Product Attributes:
- WARNING CA Proposition 65: Yes
- Paintable: No
- WARNING CA Proposition 65 Message: Cancer And Reproductive
- Works w/Toolbox: No
- Front Opening: No
- Style: Hard Folding Cover
- Key Lockable: No
- Full Bed Access: Yes
- Rails To Install: No
- Low Profile: Yes
-
Features:
- Fashionable Matte Black Panels
- Easy On-Off Functionality
- Integrated Perimeter And Corner Seals
- Dual Hinge Seals
- The TRIAD by UnderCover is a hard-folding truck bed cover featuring matte black panels for a sleek and innovative addition to your truck bed. Integrated perimeter seals protect your truck bed from the elements, while aluminum panels enhance the security of your truck bed and support up to 600 lbs of evenly distributed weight. The TRIAD has 2 available riding positions in the fully closed and 2/3 open position for convenience to haul and manage most any cargo. The TRIAD is fashioned with easy-to-use tailgate clamps allowing quick access to the truck bed. The TRIAD hard-folding cover comes completely assembled to provide a quick and easy installation and backed by a 3-year warranty.
Additional Fitment Information:
| Vehicle | Region | Bed Length |
|---|---|---|
| 2021 - GMC Sierra 1500 | United States | 69.9 |
- AX 2019-23 GM 1500 5.10ft
- Black Textured w/or w/o Multi-Pro Tailgate
- 2019-2023 Chevrolet Silverado/GMC Sierra 1500 5.10ft Short Bed (New Body Style) Crew/Ext Black Textured w/or w/o MPT
- Armor Flex Tonneau Cover
- Product Attributes:
- WARNING CA Proposition 65: Yes
- WARNING CA Proposition 65 Message:
- Cancer And Reproductive
- Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov.
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 45 Minutes
- Rails To Install: No
- Low Profile: Yes
- Actual Color: Black
- Paintable: No
- Works w/Toolbox: No
- Key Lockable: No
- Full Bed Access: Yes
-
Features:
- Heavy Duty Panels
- Premium Grade LINE X Coating
- Dual Action Tailgate Seal
- Stylish Matte Black Appearance
- Low Profile Design
- Automatic Latching Panels
- Made In The USA
- 5 Year Warranty
- The new ArmorFlex hard folding cover is designed to protect your truck bed and its contents, while maintaining its strength, style and durability. Heavy-duty panels are coated with a LINE-X(R) specialty automotive coating designed to provide advanced protection from dents and scuffs, even in the most extreme environments. The dual-action tailgate seal offers universal tailgate operation, allowing you to close the tailgate with the last panel of the cover up or down. ArmorFlex is proudly made in the USA, and comes backed by a 5-year warranty.
Additional Fitment Information:
| Vehicle | Bed | Bed Length | Sub Model | Body |
|---|---|---|---|---|
| 2021 - GMC Sierra 1500 | Fleetside | 69.9 | SLE | Crew Cab Pickup |
- UX 2019-23 GM 1500 6.7ft
- Matte Black w/or w/o Multi-Pro Tailgate
- 2019-2023 Chevrolet Silverado/GMC Sierra 1500HD 6.7ft Short Bed (New Body Style) Std/Ext/Crew Matte Black Finish w/or w/o MPT
- Ultra Flex Tonneau Cover
- Product Attributes:
- WARNING CA Proposition 65: Yes
- WARNING CA Proposition 65 Message:
- Cancer And Reproductive
- Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov.
- Front Opening: No
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Rails To Install: No
- Low Profile: No
- Actual Color: Black
- Paintable: No
- Works w/Toolbox: No
- Key Lockable: No
- Full Bed Access: Yes
-
Features:
- Stylish Matte Black Finish
- Integrated Luminous Bed Rail Light
- Automatic Latching Panels
- Ultra Low Profile Design
- Dual Action Tailgate Seal For Easy Operation
- Made In The USA
- Carpeted Underpanels Provide A Finished OEM Look
- Weather Resistant
- 5 Year Warranty
- A hard folding truck bed cover that comes with overwhelming new features, and is topped off with an alluring matte finish. The Ultra Flex is in a category of its own. From the irresistible outward appearance, to each component beneath the cover, the Ultra Flex has been carefully crafted to be the ultimate all-purpose truck bed cover. All-new features that accompany the Ultra Flex include an integrated luminous rail light system for enhanced night vision, and a dual action tailgate seal, allowing for easy operation and you to close the tailgate with the cover up or down. Multiple riding positions allow the user to ride with full access to their bed, and full weather protection is available if the cover is in the fully closed position. Ultra Flex has an Easy Clamp-on design application and can be installed and removed easily with our newly designed L-Rail's. What's more, the Ultra Flex is backed by a 5-year warranty, making it the most desirable folding cover on the market.
Additional Fitment Information:
| Vehicle | Bed | Bed Length | Sub Model |
|---|---|---|---|
| 2021 - GMC Sierra 1500 | Fleetside | 79.4 | SLE |
- FX 2019-23 GM 1500 5.9ft
- Black Textured w/or w/o Multi-Pro Tailgate
- 2019-2023 Chevrolet Silverado/GMC Sierra 1500 5.9ft Short Bed (New Body Style) Crew/Ext w/or w/o MPT
- FLEX Tonneau Cover
- Product Attributes:
- WARNING CA Proposition 65: Yes
- WARNING CA Proposition 65 Message:
- Cancer And Reproductive
- Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov.
- Front Opening: Yes
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Rails To Install: Yes
- Low Profile: Yes
- Actual Color: Black
- Paintable: No
- Works w/Toolbox: No
- Key Lockable: No
- Full Bed Access: Yes
-
Features:
- Ultra Low Profile Design
- Allows For Full Access To Your Bed
- Built In Prop Rods Secure The Cover
- Plastic Buckles And Straps Included
- Rubber Seals And Drain Tubes Channel Water Away
- No Drill Installation And 3 Year Warranty
- Introducing the next generation of folding covers -- the UnderCover Flex folding cover. Flex combines the best of both worlds, the security of a hard locking cover and convenience of a soft roll up cover. Constructed from the best materials available, Flex will withstand the abuse Mother Nature throws at it and keep coming back for more. Low Profile -- Ultra-low profile design rests inside the bed rails allowing for a very sleek look. Full Access -- Built in prop rods secure the cover allowing your truck to be driven with the cover fully open. Easy Removal -- Entire cover can be removed in seconds with no tools needed. Secure Design -- Plastic buckles and straps are included to secure the panels in the partially open position. FRP Composite Panels -- Lighter, stronger and higher dent resistance than aluminum. Weather Resistant -- Rubber seals and drain tubes channel water away from and out of the bed. Easy Clamp-on design. No other folding cover can match the Flex for versatility, security and function. Covered or uncovered, always an option with UnderCover.
Additional Fitment Information:
| Vehicle | Bed | Bed Length | Sub Model | Body |
|---|---|---|---|---|
| 2021 - GMC Sierra 1500 | Fleetside | 69.9 | Base | Crew Cab Pickup |
- FX 2019-23 GM 1500 6.7ft
- Black Textured w/or w/o Multi-Pro Tailgate
- 2019-2023 Chevrolet Silverado/GMC Sierra 1500HD 6.7ft Short Bed (New Body Style) Std/Ext/Crew w/or w/o MPT
- FLEX Tonneau Cover
- Product Attributes:
- WARNING CA Proposition 65: Yes
- WARNING CA Proposition 65 Message:
- Cancer And Reproductive
- Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov.
- Front Opening: Yes
- Style: Hard Folding Cover
- Install Time: 15 Minutes
- Rails To Install: Yes
- Low Profile: Yes
- Actual Color: Black
- Paintable: No
- Works w/Toolbox: No
- Key Lockable: No
- Full Bed Access: Yes
-
Features:
- Ultra Low Profile Design
- Allows For Full Access To Your Bed
- Built In Prop Rods Secure The Cover
- Plastic Buckles And Straps Included
- Rubber Seals And Drain Tubes Channel Water Away
- No Drill Installation And 3 Year Warranty
- Introducing the next generation of folding covers -- the UnderCover Flex folding cover. Flex combines the best of both worlds, the security of a hard locking cover and convenience of a soft roll up cover. Constructed from the best materials available, Flex will withstand the abuse Mother Nature throws at it and keep coming back for more. Low Profile -- Ultra-low profile design rests inside the bed rails allowing for a very sleek look. Full Access -- Built in prop rods secure the cover allowing your truck to be driven with the cover fully open. Easy Removal -- Entire cover can be removed in seconds with no tools needed. Secure Design -- Plastic buckles and straps are included to secure the panels in the partially open position. FRP Composite Panels -- Lighter, stronger and higher dent resistance than aluminum. Weather Resistant -- Rubber seals and drain tubes channel water away from and out of the bed. Easy Clamp-on design. No other folding cover can match the Flex for versatility, security and function. Covered or uncovered, always an option with UnderCover.
Additional Fitment Information:
| Vehicle | Bed | Bed Length | Sub Model | Body |
|---|---|---|---|---|
| 2021 - GMC Sierra 1500 | Fleetside | 79.4 | SLT | Extended Cab Pickup |
- EL 2019-23 Sierra 1500 5.10ft
- Black Textured Without Multi-Pro Tailgate
- 2019-2023 GMC Sierra 1500 5.10ft (New Body Style) Short Bed Ext/Crew Black Textured-w/o MultiPro TG Black Textured
- Elite Tonneau Cover
- Product Attributes:
- WARNING CA Proposition 65: Yes
- WARNING CA Proposition 65 Message:
- Cancer And Reproductive
- Warning: Cancer And Reproductive Harm - Www.p65warnings.ca.gov.
- Front Opening: Yes
- Style: Hard Non-folding Cover
- Install Time: 15 Minutes
- Rails To Install: No
- Low Profile: No
- Actual Color: Black
- Paintable: No
- Works w/Toolbox: No
- Key Lockable: Yes
- Paint Color: Textured - Non-paintable
- Full Bed Access: No
-
Features:
- New Single Lock Handle
- OEM Codable Lock
- LED Light Is 3X As Bright And Removable
- Lanyard Helps To Easily Access Cargo Just Out Of Reach
- Weather-Tight
- Lightweight
- Easy On/Easy Off Design
- Heavy Duty Steel Powder Coated Frame Rails
- Includes Garage Wall Storage System
- Sleek Styled Contour Custom Fit
- The Elite By UnderCover Is The Most Refined UnderCover To Date. It Is Meticulously Designed, Engineered And Produced, But Its The Remarkable Features That Set It Apart. Completely New Design, Adding The Handle to The Back,Codable Lock And Brighter Removable LED Light.
Additional Fitment Information:
| Vehicle | Bed | Bed Length | Sub Model |
|---|---|---|---|
| 2021 - GMC Sierra 1500 | Fleetside | 69.9 | SLT |
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