Originally Posted by sewingladydi
The Superior Threads website has a video regarding the cotton vs poly thread questions. Each has it pros & cons, but the poly is not "bad" nor will it harm your quilts.
Also try searching this site. There was a lengthy discussion on this topic not too long ago.
We had a video presentation by Bob of Superior Threads at our quilt guild meeting. he explained that poly thread will not "cut' your fabric. Do not worry about the poly thread