Marathon fabric (also known as Duramax or Interweave) has been the go-to choice for automotive tweed fabric because of its stain-resistance and durability. Available in a wide array of colors, Marathon auto tweed fabric is still the most popular choice today for most North American camper van builders.

Marathon Plus is Marathon fabric with a backing layer of closed-cell foam. Having the backing layer already attached makes this product easier to work with, removing one more step and saving builders time and money.