It is the same fabric used in commercial fertilizer bin tarps. As the wind moves over the flat foam spa cover it creates lift, once it does more air rushes into the space between the water surface and the bottom of the rigid foam hot tub cover. What about children and this type of Hot Tub Cover? Will they be safe with this Spa Cover? We firmly believe that these Hot Tub Covers are the safest on the market, however, it is no substitute for diligent supervision. The thread used to join the SpaCap Hot Tub Covers together, is the same strength and weight thread used to make truck tarps. However because of the design of this Hot Tub Cover, the locks will not be in the same places as a rigid foam spa cover would be. Will the cats claws puncture this Hot Tub Cover? Most animals leave SpaCap Hot Tub Covers alone because being an air chamber it is not that comfortable to walk on. Every SpaCap Hot Tub Cover is custom made to order in the USA, built to last, and to look good for years to come! Can a Hot Tub Cover that does not use foam handle a snow load? SpaCap Hot Tub Covers can handle more heavy snow than any rigid foam filled spa cover because the bottom of the cover is supported by the water in the hot tub. Everything from trees to patio roofs collapse on the SpaCap Hot Tub Covers and they always hold up better then any regular foam Spa Covers. The SpaCap Hot Tub Covers have been on the market for nearly thirty years. During that time, with thousands of covers in use on hot tubs all over the world there have been plenty of impact occurrences. My cat likes to get on the hot tub. When the snow gets too heavy, the rigid foam Hot Tub Cover will sag or break. If you're replacing your hot tub cover because of pet damage you should figure out a way to keep them away from the spa before you replace it with ANY new cover.. All vinyl including the top of the line Marine grade is rated by HOURS outdoors and Sunbrella is rated by years. It would be safe to say that if they didn't hurt your rigid foam filled hot tub cover they for sure won't hurt a SpaCap Hot Tub Cover. The typical rigid foam filled Spa Covers try to act like a bridge over the spa water. Sunbrella is quite literally the world standard in outdoor fabric. This increases the lift and makes the hot tub cover fly. A SpaCap Hot Tub Cover after a direct hit from a tree fall. The largest most expensive yachts in the world use the exact same fabric used on the SpaCap Hot Tub Covers. Checking the Spa Cover for the proper inflation I have had Hot Tub Covers get blown off during wind storms. Even when your rigid foam cover is too saturated to lift it will still fly given enough wind. There are animals that master it, but it would have to be something larger than your average cat do not damage the SpaCap Hot Tub Cover at all as a rule. These air filled Hot Tub Covers have gone through world record snowfalls and to date with thousands sold around the world there has not been even one crushed by a snow load. That means the material can handle some of the most extreme chemical exposure. It has a base polyester fabric that is then coated with vinyl on both sides. SpaCap Hot Tub Covers are made from the absolute best outdoor marine grade fabrics. Again, because these Hot Tub Covers lay right on the water's surface, there is no negative pressure, caused by airflow, to allow the Hot Tub Cover to lift off of the spa. Spa Vinyls are rated by hours of exposure where as Sunbrella Marine Acrylic is rated by years. What if something falls on the Hot Tub Cover? The SpaCap Hot Tub Covers can typically handle far more abuse than any rigid foam Hot Tub Covers ever could. The underside of the SpaCap Hot Tub Covers are a vinyl-coated fabric similar to that used for Achilles and Zodiac inflatable boats and commercial truck tarps. How do the Worlds Best Hot Tub Covers handle the wind? The Custom made Hot Tub Covers that use air rather than rigid foam panels do quite well at staying in the on the spa, basically because it makes a lousy wing. We recommend that you use the same precautionary action that you would take in any other situation. The Spa Cover was undamaged. The typical rigid foam hot tub cover is made from the cheapest material that still appears to have quality. As opposed to SpaCap Hot Tub Covers that rest right on the surface of the water, no matter how deep the snow the weight is evenly supported by the water. We recommend that turn post fasteners be used for customers with small children and if requested we can install the same locks on our Hot Tub Covers that are used at large in the spa cover industry.