["MONOFIN: 1 mermaid mono fin/training fin. Swim faster with monofin can enjoy Dolphin Kick in pool lake. Fits youths shoes 2-7(US)/EU 24-37 (4 6 8 10 12 years)" MATERIAL: Soft TPR material Easy to put on/off can tight easily use a quick-release foot strap so that your feet can quickly be removed from the fin for safety MERMAID OPTION Helps kids to increase swimming interests under adult supervision. MERMAID Tale DREAM: Fits for our mermaid swimsuits/bathing suit gives to children a chance to fulfill the mermaid dream. Good to have mermaid pool party SAFETY TIPS: This item poses a high risk of drowning and is only intended for using by competent swimmers. Kids for swimming use must be under adult supervision. Before to use please read our manual carefully]