What is FSR?

Fabric Stress Reinforcement (FSR)

FSR®- Fabric Stress Reinforcement

FSR is the long term solution for a long life cover.

FSR is a 2” wide, 1000 pound test webbing sewn on the inside of the roof.

FSR provides the necessary support to the fabric to offset the added weight caused by wind, rain, snow, ice and gravity. It also helps support the continual weight of the side fabric.


The Choice is Clear:
CalMark RV Covers with FSR Exclusive Roof Construction (Fabric Stess Reinforcement) is the Solution for Long-Term Outdoor Protection for your RV.

All CalMark RV covers are breathable, water resistant, non-abrasive and mold/mildew resistant.

All CalMark Covers Include:

  • 1 Zipper Door
  • 6 Year Warranty
  • FSR (Fabric Stess Reinforcement)

All CalMark Covers are:

  • Sunbrella® – wover acrylic fabric
  • 100% USA Made
  • High UV Rating
  • Breathable
  • Water Resistant
  • Non Abrasive
  • Mild and Mold Resistant

To order call 1-800-838-7236 or or request a FastQuote!