Halero Underfelt Carpet 78x40 Grey — 21.12 sq ft Speaker & Boot Liner, Flexible Polyester

Halero 78"×40" grey underfelt carpet is a durable, flexible 21.12 sq ft polyester fabric panel designed for speaker boxes, trunk liners, boats, RVs and automotive interior projects.

This unbacked grey carpet sheet combines heavy-duty polyester fiber construction with a soft, low-profile finish to protect components, improve appearance and resist common automotive contaminants. Delivered folded for convenient shipping, the panel can be trimmed, shaped and smoothed to fit speaker enclosures, subwoofer boxes, cargo areas or upholstery lining in cars, trucks, RVs and boats.

What makes this Halero carpet suitable for speaker and subwoofer boxes?

The dense, non-woven polyester pile offers a smooth surface that conceals screws and seams while dampening minor vibrations and blending with interiors. Its flexibility lets you conform the sheet to curved panels and tight corners without excess bulk.

• 21.12 sq ft panel size (78" × 40") covers most single enclosures or large trunk sections.
• Unbacked, easy-to-wrap construction for tight corners and glued joints.
• Low-profile pile reduces resonance and presents a clean finished look.

How does it stand up to automotive and marine environments?

This carpet is solution-dyed and formulated for color retention plus resistance to oil, gasoline and salt, making it appropriate for vehicle interiors and light marine use. UV protection helps prevent premature fading when exposed to sunlight through windows or deck openings.

• Solution-dyed polypropylene/polyester blend resists fading and staining.
• High chemical resistance to oil, gas, and salt extends service life in rugged settings.
• Flexible and easy to cut for precise fits in trunks, boats and cargo areas.

How do I fit and finish the carpet for custom projects?

Because the carpet ships folded, allow it to relax flat for several hours or apply light steam/ironing to remove creases before installation. Use standard carpet adhesive, spray adhesive or contact cement for permanent bonds; staple, hot glue or double-sided tape works for temporary mounting.

• Lay flat or use light steam/iron to remove shipping folds prior to trimming.
• Cut with utility knife or heavy-duty shears for clean edges and tight radii.
• Adhere with spray adhesive for full coverage or staple around edges for removable panels.

What size and durability can I expect from this grey underfelt panel?

The single-panel dimensions of 78 inches by 40 inches provide 21.12 square feet of coverage—large enough for many trunk liners, speaker boxes or upholstery projects. Constructed from 100% polyester fiber in a non-woven form, the material tolerates repeated handling and keeps its integrity under regular use.

• Dimensions: 78" (width) × 40" (length) = 21.12 sq ft coverage.
• Non-woven polyester fiber resists fraying and heavy use in installations.
• Folded for shipping; unfolds and smooths for immediate use.

Who this is for: installers, DIY audio builders, car detailers and boat or RV owners who need a robust, easy-to-cut grey underfelt for speaker boxes, trunk liners or interior trim. If you want a flexible, fade-resistant carpet that adapts to curved enclosures and high-wear vehicle areas, this Halero panel provides a cost-effective, durable solution with a 12-month quality warranty and responsive customer support.