Knowing Fibers of Carpet

Wool Pros- Has a superior texture retention, is natural opaque, so it dyes easily and can take in color. Wool is naturally fire retardant.   Wool is warmer in winter and cooler in summer.  Wool is green and recyclable and is renewable resource from sheep.
Wool Cons-Wool is easily stained, so liquids (fruit juices, Kool-Aid, pet urine) will stain. DO NOT use bleach as it dissolves wool.  Typically cost more than synthetic carpets.

Nylon Pro- is a synthetic fiber, strong and resilient, and abrasion resistant. Nylon dyes easily, therefore can stain easily. It cleans easily and impression marks from furniture tend to easily bounce back from Stem cleaning.
Nylon Con- Can stain easily, exposure to sunlight can fade the color of the nylon. And is highly affected by bleach.

Polyester Pro- synthetic fiber that easily dyed. It is easily cleaned and resistant to more dyes, Including Kool-Aid and red wine. It is resistant to sun fading and discoloration from animal urine.  It is "oleophilic" which means it likes oils, and if oils are not cleaned right away they will bond to the fiber.

Polyester Cons- wears easily in high traffic areas, oil bonds to fiber causing discoloration.
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Olefin Pro- is a synthetic fiber, extremely colorfast since its "solution" dyed, which means the color is added while the fiber is being made.  Olefin is light weight, it is actually lighter than water and is the only fiber to be lighter than water.  It does not absorb moisture, so it is difficult to stain. It is also resistant to sun fading and fume fading.  It like polyester likes oils, so they need to be cleaned immediately.
Olefin Con- It compresses easily, lacks resilience, oils bond to fiber causing discoloration.