sulky shreds like crazy, it is not the best quality cotton. The only thread brand for FMQ I found had no shredding was Superior King tut, and the only thread brand of cotton I haven't tried for FMQ is presencia, all others brands shred for me, even some of the high named ones like aurifil, so at this time king tut is the highest quality as they are truly egyptian grown long staple cotton. You want a long staple cotton for the least amount of shredding and there are few brands that really offer the 2 which is why many brands shred. Poly rarely shreds which makes it easier to use for FMQ so I like poly as well. Isacord and Superior make nice poly threads. Superior does offer try me spools for about half the price to see if you like their thread