Description Merfin's are a great way of encouraging children into the water & building water confidence skills. Designed to be used with the ' Dolphin Kick' style of swimming they increase core & leg strength. Fit & features Safe & comfortable Builds confidence in the water Fast release foot strap Increases core & leg strength Adjustable strap allows it to fit shoe size 30-37 Suitable for older swimmers aged 6-12 years Always use with adult supervision This is not a life saving device or swim aid