ok, then to answer your question: NO, it's not 100% undetectable. To expect that is to be unrealistic and to be unrealistic means you shouldn't be wearing. it can be 98% undetectable (whatever that % means) if you get a great attachment and conditions are ideal. But you won't always have a perfect attachment. One must error on the side of lower expectations. i predict you will go back to wearing hair and then realize it's not for you and then continue the cycle a few more times.