Cotton is a natural fiber.  A lot of smaller throw rugs are made with cotton.  It is also commonly used in hand knotted rug construction as warps and wefts. 

Why we love it: Easy to clean, smaller products made of this material can be placed in home washer and dryer, less expensive

Things to consider: Doesn’t always wear well over long periods of time, may shrink after cleaning

Best for: Kitchens, bathrooms