I have been using Isacord Poly for over 20 years. I have tried many other threads and never got "better than Isacord" results so I continue to use it. They don't sell it locally where we live now so I have to buy it on-line. When I have an emergency and need a certain color right now, I buy Robison Anton poly. It is available locally and gives me "same as Isacord results.