This is an authentic product purchased from the official website. I have used it about 5 times. ★Instant purchase OK!!! ★No-comment transaction OK!!! Style up with this upper arm compression innerwear, proven to burn calories! The compression support tightens sagging upper arms. In addition to correcting posture, the uneven texture on the back of the fabric also helps with swelling care and warming up♪ Please understand that this is a used item, so only those who are okay with that should purchase!