Water resistant materials

Smooth surfaces are easier to clean, and any roughness will encourage microorganism growth. Most people don't have much of a problem with standing on wet ceramic or fiberglass. My feet are grippy enough that I've never slipped in a shower, maybe you have less foot traction to work with than most.

A bath mat might help. Just replace it every few months, and clean it weekly. Also consider installing a hand rail as a more clean and permanent solution.

>>8975282
The slipperiness is usually biofilm and/or soap scum. It can make any surface pretty damn slick. Try scrubbing the floor for a minute before each shower/bath. Just toss a plastic pot scrubber on the floor and scrub away using your foot.

Make sure to rinse your feet really well after you've put soap on them for scrubbing. Leaving soap scum behind will make them super slick.

>What material can we use instead?

Spray adhesive + a sprinkle of sand. Great for showers, but shitty for tubs if you sit down in them.

>>8975282
Use sandals