Wool offers a deep, rich look and feel with excellent resilience and durability. Although it’s naturally stain resistant, it requires a high level of maintenance, including mothproofing. 

Nylon is the most common carpet material. It’s the strongest fiber, making it an excellent choice for heavy traffic areas. It’s also the most durable of the synthetics, easy to clean and maintain. Nylon is soil- and mildew-resistant, resilient and non-allergenic. Some nylon may pill and be prone to static. 

Olefin (Polypropylene) was originally for outdoor carpeting and basements due to its resistance to moisture, water damage, staining, pilling, shedding and static. Now it's more widely used for its durability. Olefin is dyed before it's made into a fiber and therefore is colorfast. (Olefin is naturally stain resistant)

Polyester has built-in stain resistance built right into the fiber itself. It offers you more carpet for your money and a huge selection of colors and functional textures. It also is non-allergenic, sheds moisture, resists moths and mildew and cleans easily.

P.E.T. (Polyethylene terephthalate) polyester is one of the strongest man-made fibers. Its versatility, durability, and inherent resistance to stains make P.E.T. a popular choice for carpet.

Acrylic is the closest to wool of any of the synthetics. Acrylic is manufactured primarily for commercial use. It offers soil resistance, excellent clean ability and resistance to static, moths and mildew. Acrylic is available in a wide choice of colors, and is less likely to fade in bright sunlight than nylon or polyester.