Superband Mermaid Tails for Kids Fantasy Mermaid Tails from Superband Size Chart with years and height recommend: Size 110 :for height:39 inch-43 inch,waist 38-48cm/14.96-18.90inch, tail length 65.0cm/25.59inch,recommend 3-4 years. Size 120 :for height:43 inch-47 inch,waist 41-52cm/16.14-20.47inch, tail length 67.5cm/26.57inch,recommend 5-6 years Size 130 :for height:47 inch-51 inch,waist 43-54cm/16.93-21.26inch, tail length 71.5cm/28.15inch,recommend 7-8 years Size 140 :for height:51 inch-55 inch,waist 46-58cm/18.11-22.83inch, tail length 75.5cm/29.53inch,recommend 9-10 years size 150: for height :55 inch-59 inch,waist 48-62cm/18.90-24.41inch, tail length 79.0cm/31.10inch,recommend 10-13 years Note: if your kid is a bit young and not a strong swimmer,please stay with them while swimming.as When the mermaid tail with fin use to swim,it will be a little heavy.Please pay attention on your children. Safety Warning:This item poses a high risk of drowning and is only intended for used by competent swimmers who are over 3 years old under strict competent adult supervision at all times, regardless of swimming ability. Before use, please read our manual carefully. Galaxy Mermaid Tail Sets Galaxy Mermaid Tail Sets Rainbow Mermaid Tail Sets Rainbow Mermaid Tail Sets Starry Sky Mermaid Tail Sets Starry Sky Mermaid Tail Sets Monofin Included No Monofin ✓ No Monofin ✓ No Monofin ✓ Swimmable Fabric ✓ ✓ ✓ ✓ ✓ ✓ Machine Washable ✓ ✓ ✓ ✓ ✓ ✓ 30 Day Satisfaction Guaranteed ✓ ✓ ✓ ✓ ✓ ✓