FinFun Mermaid Fin Ariel Green with Monofin

Brand new in package. I bought 2 identical to learn with a friend, but she backed out. Keeping mine and never even opened the other. It is a FinFun Youth Extra Large but it fits great since the fabric loosens in the water, and a Monofin Pro. I put the monofin in the fin and put it in the water. Then slip my feet into the monofin and pull the fin up in the water. That way it fits snug in the water and doesn't loosen and slip or roll down while I'm swimming and doing tricks. I'm 5'6", 130lbs, 23" waist, 35" hips, and Women's 10 shoes. By their size chart, it should fit: Waist: 24-27 inches Hips: 28-32 inches Tail Length: 29-37 inches Shoes: US 4-12