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What’s the Difference Between Stayfast and Twillfast?

May 20, 2019 By Nadeem Muaddi 11 Comments

The Hog Ring - What the difference between Stayfast and Twillfast

Among Haartz Corporation‘s impressive range of OEM and aftermarket convertible topping are its Stayfast and Twillfast lines.

Upon first glance, it can be difficult to tell the two fabrics apart. Both have a three-layer design with the middle layer being an elastomeric film, which provides superior waterproofing and acoustical qualities.

But there are three main differences between the toppings – namely their weaves, backing fabric and acoustical performance.

We spoke to Matt Williams, director of business development at Haartz, to better understand what this means for car owners.

1. Different fabric weave

The Hog Ring - Stayfast and Twillfast weave
Stayfast square weave (left) vs Twillfast twill weave.

On the surface, the fabric is virtually the same. But look closer and you’ll see a slight difference in the weaves.

“The ‘face’ or top of the material in both cases is a solution dyed acrylic that’s been treated with Haartz’s proprietary water repellant formula,” said Williams. “This fabric is extremely resistant to the elements. They both also utilize the same exact yarn, meaning that a black Stayfast top will have the same type of yarn as a black Twillfast top.”

The main difference between the two materials is the fabric weave.

While Stayfast has a square weave acrylic as its face, Twillfast has a twill weave acrylic as its face. It’s a minor aesthetic difference that doesn’t impact performance.

2. Different backing fabric

The Hog Ring - Stayfast and Twillfast backing
Stayfast plain cotton fabric backing (left) vs Twillfast decorative weave polyester backing

The backing fabric used for each topping is also different.

Turn Stayfast over and you’ll see plain black cotton fabric. Twillfast, on the other hand, features a decorative weave polyester on its underside.

Both look great, but Twillfast’s backing fabric looks a bit fancier.

“This was developed because so many vehicles these days are coming without headliners and the OEMs still wanted the inside of the vehicle to look upscale,” said Williams.

Again, the difference is aesthetic and doesn’t impact the tops’ functionality.

3. Different acoustical performance

The Hog Ring - How Haartz Innovations are Changing Cars

The differences between Stayfast and Twillfast make the latter slightly heavier, which has an impact on acoustical performance.

“The Twillfast has better acoustical properties than the Stayfast because of its heavier weight. This results in a quieter ride when the top is up,” Williams said.

Of course, that doesn’t mean Stayfast lets in a lot of road noise. On the contrary, all of Haartz’s toppings are designed to provide acoustical performance that rivals traditional hard tops.

Regardless of which topping you choose, you’ll be able to talk on the phone, hold a conversation with passengers and comfortably listen to the radio at a low volume.

So why do these differences matter?

The Hog Ring - BMW 6-Series convertible

Deciding between Stayfast or Twillfast comes down to the look you want to achieve and how important acoustics are for you.

“We sell a lot of both types of materials to OEMs and the aftermarket,” said Williams. “Many consumers want to replace their original top with the same type of material that came from the factory and some only want to change the look a little bit. Others want to upgrade from a Stayfast top to a Twillfast top because they like the look and it’s quieter.”

“At the end of the day, whether you’re an OEM designer or a consumer, it depends on your personal preference,” he added.

To learn more about all of Haartz’s cloth topping materials – including PVC topping, Bluesky, Landmark and Sonnenland – visit Haartz.com or follow them on Facebook, Twitter and Instagram.

Filed Under: Archive, Products & Reviews, Site Sponsors Tagged With: Auto Trim, Auto Upholstery, Car Interior, Convertible Top, Haartz Corporation, Stayfast, Twillfast

Reader Interactions

Comments

  1. Rudy wilson says

    May 21, 2019 at 10:34 pm

    Why did they stop making these front seats that fold down to bed?

    Reply
    • William R. English says

      November 20, 2020 at 9:36 am

      It is very difficult to determine the answer to this. You would have to actually ask the OEM. My guess would be that market research suggested a shift in consumer demand, rendering it either too time consuming or expensive for the assembly line.

      Reply
  2. John E Goreham says

    June 9, 2019 at 4:04 pm

    Great overview. I was wondering what the difference was.

    Reply
  3. Perry says

    March 28, 2020 at 1:50 pm

    OUTSTANDING. VERY informative. Ty

    Reply
  4. Arnold says

    June 2, 2020 at 8:56 pm

    Which one repels dirt and cleans easier?

    Reply
    • William R. English says

      November 20, 2020 at 9:30 am

      https://www.haartz.com/cleaning-guide

      As the top layer for both products are very similar, so are the cleaning methods. Please, only attempt to clean your top using the suggested methods on our website.

      Reply
  5. John says

    September 25, 2020 at 1:08 pm

    What is the difference in price?

    Reply
    • William R. English says

      November 20, 2020 at 9:32 am

      Since Twillfast has additional layering for better acoustics, it is more costly to produce. Pricing would depend on minimum order quantity. For small yardage amounts, check out the following trusted distributors:

      http://www.veteranco.com

      http://www.miamicorp.com

      Reply
  6. William R. English says

    November 20, 2020 at 9:40 am

    It was very nice to see commentary by Mr. Matt Williams in this article. He is a very respected voice and personality in the industry. Thank you for this. Not all voices can be trusted, but this is solid if Matt was interviewed.

    Reply
  7. steve brown says

    July 9, 2021 at 12:45 pm

    Good Info –
    Where can i find a Black outside and Gray inside / backing color – 1957 – Porsche

    Thanks –

    Steve – 6190840-3948

    Reply
  8. Eugene Labarda says

    January 20, 2022 at 7:11 am

    how much is the stayfast per yard includind shipping fee?
    how much is the twillfast per yarf including shippung fee to Philippines?
    can i 0rder 3 yards only?
    how much is soft top cover ready made for each material?
    can i have catalog and pricelist for both?

    Reply

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