Polypropylene (polyprop) carpets are made from a man made synthetic fibre, most of these are bleach cleanable which make it more user friendly than wool.
Wool carpets come in a mixture of pure wool and wool with synthetic fibres ranging from 50% wool 50% synthetic up to 100% wool.
It is possible to have the luxury feel of a wool carpet but with all the benefits of a polyprop, for example we have a range called Mistral with wool technology.