Our cats are an integral part of our R&D & two of the more exotic finishes that they've put through their paces were an imported grey dyed coir from India used on a Fatcat 4/Bobcat & Polecat finished in a Crucial Trading striped wool carpet.  

 

The set looked fantastic & the grey stained coir was stocked as our special Concrete Coir finish for a while but the wool Polecat didn't stand up to our cats' scratch & climbing test so wasn't taken up as a special finish option.