fin fun mermaid tail, reinforced tips, monofin included, berry splash, adult xl fin fun this mermaid tail includes the patented fin fun monofin for swimming the fin fun monofin includes an engineered flexible, unbreakable polypropylene insert with a dive grade neoprene cover, not a flimsy piece of plastic with uncomfortable elastic. designed for maximum propulsion, while maintaining a mermaid shape. feet are not strapped in, making removal in the water easy; a tug, a kick and you’re out! swimsuit tail fabric stretches around monofin. exclusive fabric designs look like real scales on land and magical mermaid scales in the water! how to size mermaid tails please measure your mermaid to ensure accuracy in sizing. waist measurements are measured at the waist. hips are measured around the fullest point in the hip area. length measurements are measured from the waist to floor. sizing: child 6, waist 22-23 inches, hips 24-25 inches, length 23-26 inches child 8, waist 23-24 inches, hips 25-27 inches, length 25.5-28.5 inches child 10, waist 24-25 inches, hips 28.5-30 inches, length 29-32 inches child 12, waist 25-27 inches, hips 30-32 inches, length 33.5-37 inches sizing for adults: adult x-small, waist 26-28 inches, hips 35.5-37 inches, length 35-50 inches adult small, waist 28-30 inches, hips 37.5-39 inches, length 35-50 inches adult medium, waist 30-34 inches, hips 39.5-41 inches, length 35-50 inches adult large, waist 33-36 inches, hips 42-44.5 inches, length 35-50 inches important safety information only for experienced swimmers ages 6 and up, not a flotation device, adult supervision required. taking care of your mermaid tail machine washable gentle cycle cool water, hang to dry.