There are a few different types of rug materials that can be used in the bathroom, but the best option would be to use a material that is resistant to mold and mildew. Some good choices for bathroom rugs include polyester, nylon, or olefin. These materials are all resistant to moisture and won’t easily absorb water, which will help to prevent mold and mildew growth. Another thing to consider when choosing a bathroom rug is the amount of traffic it will see. If the rug is going to be located in an area where there is a lot of foot traffic, then you might want to choose a more durable material such as wool or cotton.