Add contour to your quilts without any unsightly stitching worries with gutermann smoke invisible thread this brilliant handy thread is soft strong and smooth making it perfect for all of your invisible sewing needs the flexible thread comes on an easy to use snap on spool with no rough edges to create tangles snarls or breaks of the thread this clear thread will not melt with normal ironing on the cotton setting so you can be sure that its a practical choice it works well in the bob