Hi! Since these are not glazed tiles, you don't to worry about the slip effect that those types of tiles can have. That said, anything can be slippery in a shower if not installed properly. We commonly sell our cement tiles for shower applications and I personally have cement tile as my shower floor. I've never slipped and it doesn't feel slippery to me :) You can install these (and any tile) with a slightly wider grout line to give your floor some added texture. There are also additives like Shark Grip which can be applied across the tile to give it texture if you feel like it's too slippery. But overall, cement tile is not known to be slippery! Hope this helps!