It's the perfect balance of not too tight and not too loose. They won't crush the edges of your board like they would with a nylon strap alone, and they won't flap around like a big rubber band like bungee cords. I use three in case one ever fails (ask an engineer). I was skeptical given the price compared to the alternatives but now I like them much better, they seem like a good deal. I'd be very sad if Thule discontinued them: REI stopped selling them, but luckily they're still available from Revain. The REI guys said they see many SUP boards with warped/crumpled edges due to over tightening and this solution is highly recommended. Now I agree. I wrap them in soft, rubberized foam, the pipe insulation they sell in hardware stores in 6 or 8 foot lengths. Helps protect my boards even more. They seem to "grab" a little better than, say, the old floating "pool noodles". They are long enough to work with the 32" wide SUP I have and the larger 28" displacement that rides on it. Toyota Highlander with roof rack pads. I have some short nylon webbing loops as extensions but I didn't need them.
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