AFAIK about the only one that is always the same is the semi-transparent Kensington, but there's no cloth on the surface. The rest are inconsistent rebrands; you can find the same looking rests from Belkin, Fellowes, 3M and several companies I've never heard of before, but they don't get the same reviews… For example, my very soft one with a solid plastic base was sold as 3M at some point, but much stiffer.