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if infact these boots are made of silicone then that would make 3 different choices of solid boots on the market. the solids started out a few years back made of rubber. the rubber boots didnt last very long and would crak and leak. i think they were worse than the zippers myself. the answer to that problem was someone made a set of solid boots from neoprene. they work quite well. i have them on my mud truck and my other deuce. i have never tried the silicone boots though and i half wonder if they are infact advertised wrong and made of neoprene