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It's definitely not chew proof. I go through one of these liners about every 2 years. At the two year mark it seems the guinea pigs have chewed through the black velcro strips as well as part of the liner itself. I have plenty of toys and wood for them to chew on but for some reason they still like to gnaw on the liner. I recommend buying the liner during black friday. I saw them on sale and I forgot to buy it....much to my wife's displeasure as I ended up paying full price for this one. She wasn't happy because she told me to buy it during Black Friday and I said I would....but then of course I forgot all about it.
I bought the MidWest cage from the breeder I got my guineas from and the liner smelled terrible!! I found the replacement here and this was PERFECT! Smell is gone and this fit perfect with the cage :) RECOMMEND.