I did a little more research and I think the choice is between the Moshi ClearGaurd, which is 0.1mm thick and made of "non-toxic engineering-grade thermoplastic urethane", or the KB Covers silicone-based cover which is 0.5mm thick. Does anyone know if one of those two materials would be less slippery-feeling?
feel like you're not pressing the keys and they attract a lot of dirt dust unlike the other plastic ones which are clear and not white translucent like silicon.