After reading the installation instructions, I was wondering if anyone can tell me what the "fasteners" are? Are they Velcro or some other material and what do they actually attach to? Also is it hard to slip the cover under the headrest guides? I isn't clear how thick the material is. We just adopted a dog and I need to get something on the rear seat ASAP. Can anyone say how they've help up long term? Was also looking at a product from petco that slips over the headrests etc. thanks
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