Plush/velour - Traditionally these carpets are soft non-twisted fibre with a velour finish. Will show footprints similar to "walking in sand."
Sometimes called velvet-plush or simply velvet. A luxurious smooth-textured, highly finished,cut pile carpet surface with a very smooth and soft finish. Plush is usually longer and more dense than a "Saxony".
I think the synthetic mix is a blend of Polyester,nylon and acrylic.
I have always found them a nightmare to lean if they are trashed and most dye based stains wont come out.