The Model is wearing a Hard Plastic Monofin , the Monofin can keep the tail Shape,BUT the Monofin need BUY Separately.If you want the Mermaid tail for swimming , please Buy a Mermaid tail + buy a Monofin.Package 1 include:1* Mermaid Tail + 1* Tops + 1* Panties + 1*Garland + 1* Mermaid Necklace (Totally 5 items /Set)Features:1. Very Cute and Beautiful , Perfect for Summer Surfing, Beach Holiday, Bathing , Swimming, Cosplay , Birthday Gifts, Christmas Gifts.2. Can Swimming If you put a Swimming fin in the tail.3. A beautiful Mermaid Necklace.4. The Material feels smooth, stretchy and breathable, it is perfect for swimming5. It can fit for age from 3-13 YearsSize ReferenceNotice:In the product link, there are many selections for you to Select, different selections have different items, show as on the selection picture , also the price is different , Please pay attention to it when you place the order , thanksSizeTail LengthTail HipsTail WaistRecommend Height110 (3-4T)100cm / 39.4"52cm / 20.5"40cm /15.7"100-110cm120 (5-6T)105cm / 41.3"55cm /21.6"42cm / 16.5"111-120cm130 (7-8T)110cm / 43.3"58cm / 22.8"45cm / 17.7"121- 130cm140 (9-10T)115cm / 45.3"62cm / 24.4"47cm / 18.5"131-140cm150 (10-13T)120cm / 47.2"66cm / 26.0"50cm 19.7"141-150cm1. Please Allowed 1-2cm Inaccuracy Due to Manual Measurement, Thanks ( 1cm = 0.39inch,1inch=2.54cm).2. The Fabric is high elasticity, You can select the size according the Kids Height.The Hard Plastic Monofin Fin need buy SeparatelyComfirm Address with Full NameAll products will be Checked strictly before shipping. Please make sure your address is Correct , and the include the street and house number, and Also Full name is very important for faster delivery.Shipping1. We ship parcels to your default address on aliexpress. Please comfirm your address before making order.2. For International trade, shipping maybe slightly delayed due to customs inspeciton and other accident event,3. If you are in urgently need of the order, Please choose such as DHL, EMS, But you should pay corresponding shipping fees. Hope you can understand.4. If your delivery protection time is running out but you still not receive the order, please contact us and we will help you to extend itFeedback1. Customer's satisfaction is our ultimate goal.2. If you are satisfied with our product and service, please leave us positive feedback and 5 stars review3. If you are unsatisfied with our service or any other problems, please no hesitate to contact us before leaving feedback, we will Try our best to resolve the issue As soon as possible, Thanks for your support.