When choosing sofa covers that are more resistant to dirt, you'll want to consider materials that are durable, easy to clean, and resistant to stains. Here are some materials commonly used for sofa covers that meet these criteria:

Microfiber: Microfiber is a synthetic fabric that is known for its durability and resistance to stains. It's easy to clean and maintain, making it a popular choice for households with children or pets.

Leather: Leather is a classic and durable option that is resistant to spills and stains. It's relatively easy to wipe clean, and many spills can be quickly addressed without leaving a permanent mark. However, leather may require specific care to maintain its appearance.

Crypton: Crypton is a high-performance fabric that is engineered to resist stains, moisture, and odors. It's often used in furniture upholstery and is a good choice for those looking for a fabric that is easy to clean.

Outdoor Fabrics: Fabrics designed for outdoor use are often resistant to water and stains. These fabrics are made to withstand the elements and can be a good option for indoor furniture that is likely to encounter spills.

Performance Fabrics: There are various performance fabrics on the market that are specifically designed to resist stains and spills. These fabrics often have a protective finish that makes cleaning easier.

Synthetic Blends: Fabrics that are a blend of synthetic fibers, such as polyester or nylon, can be more resistant to stains than natural fibers. They are often more durable and easier to clean.

It's important to note that no material is completely impervious to dirt, but these options are more resistant and easier to clean than others. Additionally, always check the care instructions for the specific fabric and follow the recommended cleaning methods to ensure the longevity of your sofa covers.