What is FSR Construction?
On all CalMark Covers, we install 2" 1000 pound test Nylon (non-Abrasive) webbing straps that are sewn across the inside top, every 4 feet. They are connected to the side panels.

Why Do I need Fabric Stress Reinforcement (FSR) in my RV Cover?
The weights of the side panels are continuously putting stress on the top panel mainly due to the weight of the side panel fabric alone. Exposure to the harsh elements of Mother Nature (e.g. wind, rain, snow, and ice) adds additional stress to the fabric on the top panel where the exposure to Mother Nature is the greatest. CalMark's rib cage FSR construction provides the added support needed to offset these long-term effects in the top panel area.
Reducing stress to the fabric will greatly slow down long-term fiber breakdown.

What is Fiber Breakdown?
Fiber breakdown is a chemical and physical weakening of the fabric fibers caused by the Ultra-Violet (UV) radiation from sunlight. This process is greatly accelerated when the fabric fibers are pulled apart due to the stress described above. This disintegration process occurs in all fabrics, some more than others, especially if the UV rating of the fabric is less than it should be. All of CalMark's fabrics are made in the USA and have the highest UV rating available. Fiber breakdown means a shorter lifetime of the cover, less protection of your RV, and costly cover replacement.

How Do I know FSR is the Answer?
Don't just take our word for it. Check with other RV owners who have experienced the headache of returning RV covers that did not have Fabric Stress Reinforcement.

Why a Full Warranty versus a Pro-Rated Warranty?
CalMark builds covers to last. With our FSR Technology (100% USA fabrics and labor), CalMark has led the industry in RV protection for over 20 years. We are confident as is indicated by our FULL WARRANTY versus the Pro-Rated Warranty offered on the majority of other covers in the industry.

FEW CHOICES - ONE SOLUTION

The Choice is Clear:
CalMark RV Covers with FSR Construction
is the Solution for Long-Term Protection to your RV and the Life of Your Cover.

"It's Good to Be #1. It's Better to Be Good. It's Best to Be Both."