You'll get lovely results for blanket stitched applique’ on wool fabrics, using a single or double strand. It just seems to melt into the wool. Each spool is 350 meters of a 50% wool/50% acrylic blend 12wt. thread. It has the look of wool but the strength of acrylic.
It can also be used with machine applique. Use a 90/14 metallic needle, 50wt. cotton in the bobbin, "drive" very slowly and you will have no problems!