Seat Trim and Upholstery
Mushroom hook, mold-in hook, loose loop and woven hook and loop for OEM seat trim, aftermarket seat covers and vehicle upholstery
OEM seat makers attach trim covers to foam with mushroom hook, molded or glued into foam channels, and loose loop sewn into the cover seams. Aftermarket seat covers and upholstery use sewn woven hook and loop. Halco converts these materials to be production-ready, packaged in the format and quantity your line runs, and changes them quickly when your needs change.
Hook and Loop for Seat Trim and Seat Covers
The first three products work together to attach OEM seat trim to foam; the woven hook and loop products serve seat cover makers and upholsterers. Halco’s knit loop material is used to produce graphically styled branded patches for seat back covers.
HALCO® Auto Mold-In Hook
Mushroom hook molded into seat foam, built to the part size and shield configuration you specify.
- Shielded or gasket sidewall construction
- Thin scrim loop or foam backing
- Meets FMVSS 302
HALCO® Auto Mushroom Hook
Fire-retardant mushroom hook glued into foam channels, slit or die-cut from 54-inch fabric we keep in stock.
- Die-cut notches let the hook follow tight curves and radii
- Tape typically 1 inch or narrower for seating; wide fabric for large areas
- FR coated; meets FMVSS 302, with burn test reports for each lot
HALCO® Auto Loose Loop
Polyester loose loop sewn into trim seams to engage Halco mushroom and mold-in hook.
- 38 mm tape with a loop center and wide selvage edges
- With Auto Mushroom Hook: 9.63 lbf/in peel, 58.38 lb/in² shear
- Guide stripes keep sewing operators on a straight line
- 500-yard crosswound spools; meets FMVSS 302
HALCO® Nylon Woven Hook and Loop
Sew-on woven hook and loop for seat covers, trim tie-downs and upholstery.
- 1/2″ to 7″ widths; black, white or 18 standard colors
- Cut lengths, stacked bundles and crosswound spools
- Meets FMVSS 302
HALCO® Hook and Loop with tack down adhesive
Sew-on hook and loop with a positioning adhesive strip that holds it in place on the cover while it is sewn.
- Adhesive strip down the center; sewing channels along each edge keep the needle out of the adhesive
- 9775WL+ transfer adhesive won’t gum sewing needles
- Applied to Halco sew-on hook and loop
HALCO® Knit Wide Loop Fabric
Knit loop die-cut into patches and shapes and heat imprinted with logos for seat trim.
- Die-cut to any shape
- Heat imprinting flattens the loop to form the graphic, with no color change
- Tested to Stellantis seat trim specifications, including fade and shrink resistance
Stellantis Makes a Big Impression with HALCO® Loop Material and Converted Parts
Halco worked closely with a Tier 1 and Stellantis to develop custom seat back patches for Jeep® and Ram® vehicles*. A custom die cut and heat imprinted logo adds a unique touch to the America 250 range. Halco Knit Loop was tested to various OEM specifications including fade and shrink resistance.
Hook and Loop Selection by Seat Application
The right hook and loop depends on where it attaches: OEM seats pair mushroom hook in the foam with loose loop in the trim, while seat covers and upholstery use sewn woven hook and loop. The table below matches each seat application to its hook, its loop and the HALCO® products used.
| Seat application | Hook side | Loop side | HALCO® products |
|---|---|---|---|
| OEM foam, molded in | Mold-in mushroom hook, shielded or gasket sidewall | Loose loop sewn into the trim seam | Auto Mold-In Hook + Auto Loose Loop |
| OEM foam, glued into channels | Mushroom hook, slit or die-cut; notched for curves | Loose loop sewn into the trim seam | Auto Mushroom Hook + Auto Loose Loop |
| Trim tie-down under the seat | Short pieces of woven hook | Woven loop, sewn | Nylon Woven Hook |
| Aftermarket seat covers | Woven hook, usually black nylon, sewn | Woven loop, sewn | Nylon Woven Hook and Loop |
| Marine and RV upholstery | Mushroom hook, glued to the base | Loop or upholstery fabric | Auto Mushroom Hook |
| Decorative loop patches | — | Die-cut knit loop, heat imprinted | Converted loop parts |
Shielded or gasket sidewall: two ways to keep foam out of mold-in hook
During the foam pour, liquid foam must stay out of the hooks or the trim won’t engage. Mold-in hook solves this in one of two ways. Seat makers specify the part size and the configuration; Halco builds to it.
| Comparison | Shielded | Gasket sidewall |
|---|---|---|
| What protects the hooks during the pour | A paper or loop cover over the hook face | Foam gaskets along both edges |
| Step at trim assembly | Peel off the cover | None |
| Labor at the line | More | Less |
| Part cost | Lower | Higher |
| Backing | Thin scrim loop or foam | Thin scrim loop or foam |
Notched mushroom hook follows tight curves
Foam channels rarely run straight. Halco die-cuts notches or triangles along mushroom hook strips so they bend around radii without buckling. Notch spacing is set by the curve: when one OEM engineer needed a sharper radius, Halco tightened the spacing to fit. The same strips are cut from stocked 54-inch fabric to any width the channel needs.
Hook and Loop Formats for Seat Assembly and seat cover Production
Halco converts hook and loop into the format each seat line or sewing room runs, so parts go straight into production without extra cutting or handling.
| Format | Typical seat use |
|---|---|
| Slit to custom widths from 54-inch mushroom fabric | Glued foam-channel hook on OEM seats |
| Die-cut shapes and notched strips | Curved foam channels, mold-in parts |
| Crosswound spools | Loose loop and woven tape for sewing lines; fewer changeovers |
| Cut to length | Seat covers, trim tie-downs |
| Stacked bundles of cut pieces | Second- and third-row bench seat covers, often about 48-inch pieces |
| Tack-down lamination | Holds hook and loop in place on the cover while it is sewn |
| Heat imprinting on loop | Logos and decorative patches |
| Dye-to-match, on request | Matching trim colors such as beige |
HAlco standard Materials meet FMVSS 302
FMVSS 302 is the federal flammability test for vehicle interior materials, including seat cushions, seat backs and head restraints. It is a material test: the vehicle maker certifies the vehicle. Halco’s standard seat trim materials meet it, so flame-retardant product is rarely needed for automotive seating. Halco seat trim products have also been tested to OEM peel and shear specifications for GM and Stellantis.
Seat flammability requirements by market
| Market | Requirement | What it means for hook and loop |
|---|---|---|
| Cars, light and heavy trucks, buses (US) | FMVSS 302: horizontal burn rate of 102 mm (4 in) per minute or less | Sewn fasteners are tested on their own; materials bonded at every point are tested with their substrate |
| School buses (US) | FMVSS 302, plus state seat-assembly fire tests in some states | The fastener is judged inside the finished seat; replacement covers must keep it passing |
| Transit buses (US) | FMVSS 302, plus the FTA’s recommended fire safety practices, which agencies often write into specs | FR hook and loop is available where a transit spec calls for it |
| Passenger rail (US) | 49 CFR 238, Appendix B (FRA) for intercity and commuter rail; transit rail specs often cite NFPA 130. Export programs may require EN 45545-2. | Seat materials are tested for flammability and smoke, or the complete seat is tested as an assembly. Small fasteners and clips under 16 in² (100 cm²) each can be exempt when covered by a fire hazard analysis. |
| Motorhomes and specialty vehicles | FMVSS 302 | Same as cars and trucks |
| Marine, ATV and off-road | Set by the builder’s material spec; off-road specs often cite SAE J369 or ISO 3795 | Ask for the OEM spec; Halco supplies test data to support it |
| Aircraft (see our Aerospace page) | FAR 25.853 (FAA); seat cushions must also pass a separate oil-burner fire test | Requires flame-retardant hook and loop; see the Aerospace page for products |
Seating markets we serve
Seat and seat cover makers often build for several vehicle markets at once. Halco supplies all of them from one material range.
| Market | What drives the fastener choice | Typical HALCO® materials |
|---|---|---|
| Automotive OEM seating | OEM peel and shear specs, FMVSS 302, line efficiency | Mold-in or glued mushroom hook, loose loop |
| Aftermarket seat covers | Longer lengths, more seams, fast sewing | Woven nylon: cut lengths, stacked pieces, spools |
| Commercial truck | Durability, replacement covers | Mushroom hook, loose loop, woven nylon |
| Bus: transit, coach and school bus | Flammability rules by bus type, replaceable covers | Mushroom hook, woven nylon; FR where specified |
| Passenger and transit rail | Flammability and smoke rules stricter than FMVSS 302; replaceable, vandal-resistant seat covers and inserts | FR woven hook and loop where specified; mushroom hook |
| RV and specialty vehicles, including ambulances and van fit-outs | Cushion retention, cleaning | Mushroom hook, woven hook and loop |
| Marine | Sun, water, cushions glued to the boat | Mushroom hook, woven hook and loop |
| ATV and off-road | Vibration, dirt | Mushroom hook, woven nylon |
| Custom upholstery: yachts, race cars | Short runs, custom shapes | Die-cut and cut-to-length parts |
Why OEM Seat and aftermarket Seat cover manufacturers choose halco
- We listen, then move fast. When your program changes, we change the product format quickly to match.
- Production-ready parts. Slit, die-cut, notched or cut to length so parts go straight onto your line.
- Packaged for your process. Crosswound spools, stacked bundles or rolls, in the quantities your line uses.
- Large in-stock inventory. Same-day or next-day shipment on stocked seat trim materials. [confirm stocked SKUs]
- Tested to OEM specifications. FMVSS 302, plus GM and Stellantis peel and shear testing.
- 3M Preferred Converter, ISO 9001 certified.
Frequently Asked Questions
What hook and loop is used in automotive seat manufacturing?
OEM seats use mushroom hook on the foam and loose loop sewn into the trim cover seams. The mushroom hook is either molded into the foam during the pour (mold-in hook) or glued into channels after molding. Woven hook is used under the seat to tie down stretched cover edges. Aftermarket seat covers use sewn woven hook and loop, usually black nylon.
How are seat trim covers attached to the foam?
Most OEM seats press loose loop, sewn into the cover’s seams, onto mushroom hook in the foam’s channels. Hook and loop attaches the cover without hog rings or adhesive at those points, and the cover can be removed for service. Some seats combine hook and loop with hog rings or plastic clips in other areas.
What is the difference between shielded and gasket sidewall mold-in hook?
Both keep liquid foam out of the hooks during molding. Shielded hook carries a paper or loop cover that is peeled off at trim assembly. Gasket sidewall hook has foam gaskets along its edges, so there is nothing to remove; it costs more to make but saves labor on the line.
How does mushroom hook follow curved foam channels?
Halco die-cuts notches or triangles along the strip so it bends around radii without buckling. Tighter curves need closer notch spacing, which Halco sets to the part.
What do the stripes on loose loop mean?
Guide stripes, single or double and in various colors, give sewing operators a line to follow so the loop is sewn in straight. Loose loop is a 38 mm tape with a loop center of about 15 to 20 mm and wide selvage edges for sewing
Are seat covers sewn or attached with adhesive-backed hook and loop?
Sewn. Seat cover makers sew woven hook and loop to the cover. Adhesive appears only as a tack-down strip that holds material in place while it is sewn.
What hook and loop is used for marine and RV upholstery?
Mushroom hook glued to the seat base is common for cushions in boats and RVs. Sewn covers use woven hook and loop.
Does Halco hook and loop meet FMVSS 302?
Yes. HALCO® Auto Mushroom Hook, Auto Mold-In Hook, Auto Loose Loop, FR Woven Hook and Loop and standard Nylon Woven Hook and Loop meet FMVSS 302. FMVSS 302 is a material flammability test; the vehicle manufacturer certifies the vehicle. Materials not bonded at every point, such as sewn fasteners, are tested on their own.
Do automotive seats need flame-retardant hook and loop?
Usually not. Halco’s standard seat trim materials meet FMVSS 302. FR hook and loop is available for programs whose specifications require it, such as some transit bus seating.
Can hook and loop be dye-matched to seat trim?
Yes, on request. Halco has matched hook and loop to OEM trim colors such as beige for leather and vinyl seats.
What widths and formats are available for seat programs?
Mushroom hook is slit to any width from 54-inch fabric; seating tape is typically 1 inch or narrower. Loose loop comes on 500-yard crosswound spools. Woven hook and loop comes in widths from 1/2″ to 7″, as rolls, cut lengths, stacked bundles or spools.
What peel and shear strength does the seat trim system provide?
HALCO® Auto Mushroom Hook mated with HALCO® Auto Loose Loop tests at 9.63 lbf per inch of peel strength (ASTM D5170) and 58.38 lb/in² of shear strength (ASTM D5169). Bond strength between the hook and the foam depends on the adhesive and foam used, so Halco recommends testing on your own materials.
* Jeep® and RAM® are registered trademarks of FCA US LLC. All other trademarks are the property of their respective owners.