Wool & Polyester
Wool is one of the best yarns for making rugs. Being a natural fibre that feels warm and soft underfoot. Wool rugs do shed, and the amount of shedding depends on the origin of the wool, length of its fibre and diameter of the fibre and its processing into yarn. Wool has some fire-retardant qualities. Note that some people can be allergic to wool.
Polyester yarn is a bi-product of oil refinement and has similar characteristics to Heat-Set Polypropylene yarn. Polyester yarn can be spun thinner (finer) and has shiny (silk look) properties.