Incredibly soft and as if you are wearing nothing at all.  So far they have stayed in place; not riding up. The cloth for making the double crotch is anchored only from the back and side seams as there is no front seam, and it is only about 2 1/2 inches in length.  I really wanted to give 5 stars, but several things stopped me.  It is tagless, but also the pairs that I received didn't have the imprinted size/care label.  And nothing in the packaging about care.  I didn't put it in my lingerie bag to wash, and it seemed all right.  Reviews indicated the fabric is robust, but care instructions would have been expected.  Also, I had to snip off a long length of thread, that should have been snipped in QC.  If they hold up, I will probably order more however.