These are much like the Invisible Strings that I have worn recently (and in several different colours). They are of the same material and have the same lightweight feel about them. They really do feel invisible, as if I have nothing on at all. I guess that’s why they call them invisible. I’ve had them on all day and I can honestly say they are really comfortable. I wish they had a pouch – that would be my only desire in these – if they had a pouch I might never take them off! I picked these up on a trip to London – not sure when, maybe last year. Got a pair for RWraith55 too – maybe we’ll see him on here in them as well!