Halero 78"x40" Grey Underfelt Carpet for Speaker

Halero's 78"×40" grey underfelt is a tough, flexible polyester carpet panel designed for speaker boxes, trunks, RVs, boats and automotive interiors.

This grey unbacked carpet sheet from Halero offers 21.12 square feet of non-woven polyester felt that resists oil, gas and salt while remaining easy to cut and shape. It ships folded and relaxes flat after a few hours; light steaming smooths creases. The fabric is solution-dyed for better colorfastness and UV resistance, making it suitable for indoor vehicle compartments and protected marine or RV use.

How well does this carpet stand up to vehicle and marine use?

The Halero felt is formulated for high resistance to common automotive and marine exposures like oil, gasoline and salt spray. While it’s unbacked for easy adhesion to curved surfaces, its polyester construction provides durability for heavy-use areas such as trunks, cargo bays and speaker enclosures.

• Made from 100% polyester fiber with solution-dyed treatment for colorfastness
• Resists oil, gas and salt — suitable for protected marine or boat interiors
• Flexible and tear-resistant for repeated handling and installations
• UV protection reduces fading in sun-exposed compartments

Can I use this for speaker boxes, subwoofers and custom enclosures?

Yes — the carpet is widely used for lining speaker cabinets, PA/DJ boxes and sub enclosures where acoustic-friendly, durable surfaces are needed. Its texture helps conceal seams and fasteners while providing a professional finish that holds up under installation stress.

• Non-woven surface improves grip for adhesives and staples
• Easily cut with utility knife to fit speaker shapes and port openings
• Width and length give enough coverage for many standard boxes and small cabinets
• Neutral grey color blends with most interior and stage setups

How do I prepare and install the carpet after it arrives folded?

The panel ships folded to fit packaging. Lay it flat in a warm room to relax for several hours; for faster smoothing, use a household steam iron on low steam from the reverse side or lightly mist and flatten. Trim with a sharp blade and adhere or staple to your substrate as needed.

• Unfold and allow to rest flat for a few hours before cutting
• Use low-steam ironing or light misting to remove creases if desired
• Cut with a utility knife and straight edge for clean lines
• Glue, spray adhesive, staples or double-sided tapes all work depending on backing

What are the exact dimensions and material details I should expect?

The sheet measures 78 inches wide by 40 inches long, giving roughly 21.12 square feet of coverage. It is an unbacked, non-woven carpet made from 100% polyester fiber and is not delivered in roll form. The product includes a 12-month quality warranty and customer support from Halero.

• Dimensions: 78" (width) × 40" (length) = 21.12 sqft
• Material: 100% polyester non-woven felt, solution-dyed polypropylene properties
• Delivery: folded panel (not rolled); lay flat to remove fold lines
• Warranty: 12 months limited quality warranty and customer support

Who is this for? Halero's grey underfelt suits DIY enthusiasts, car audio installers, RV and boat owners, tradespeople and hobbyists who need a durable, easy-to-cut interior carpet for speaker boxes, trunk liners and cargo areas. If you want a neutral, resilient surface that resists oil and salt, and can be shaped to your project, this carpet panel provides a practical, affordable solution.