Authentic! I bought it on the website GOAT. I buy all my sneakers from them. I won't even say this is used. I put it on and left the house for a couple mins and came back in realizing it was a little big on me. It's brand new! Unfortunately I took the tag out and threw the box away before noticing that. Only selling it because of the size, I need to get a 6 for me. It's gorgeous! (It's hard to find this color and size for this price) FIRM PRICE. I paid $130 for it. If I sell for less I won't get fair money on it, cause Poshmark also charges fee and shipping on top of the price.