Diane
There is no "slip proof" tile. Flooring is rated with a slip coefficient. Unfortunately there is no real regulation or compliance body to set standards. You can search for Chapter 3 Floor and Ground Surfaces to read more about it.
With all that said you will want to buy floor tile with a minimum 0.60 COF (coefficientcy of friction)
This is a universally recognized ASTM level and is accepted by all the code compliance bodies and officers I have dealt with. In hotels this is also the level required on all floor tile.
You can contact Dal-Tile at a local branch to get assistance on available products. To find a knowledgeable person at a retailer is rear in my experience.
I hope this was helpful.

Happy Holidays
Artisan Pacific Construction, Inc
Los Angeles, California

Porcelain tiles will probably be best. They are durable and nonabsorbent. You will want a tile with a COF ( Coefficient of Friction ) that exceeds 0.60 on the ASTM C-1028 test, wet and dry. This test rates the slip resistance qualities of a tile. You should be able to get this data from the manufacturer. Polished, shiny tiles will usually not meet the standards, matte or textured are generally better. I hope that helps!