100% rubber Imported Swim Fins for Kids: FINIS Booster Fins improve technique and teach swimmers how kicking generates forward movement; they're ideal for swimmers ages 8–12 High-Quality Swimming Fins: Made of natural rubber that floats, these fins help lift legs to the surface to promote proper body position Comfortable Kids Swim Fins: The open-toe design on the underside prevents chafing and provides a comfortable fit, making FINIS swim fins perfect for young swimmers Swim Flippers: FINIS Booster Fins are designed to transition young swimmers out of FINIS Fishtail 2 swim fins, providing an excellent progression About FINIS: Our mission is to simplify swimming through innovation, high-quality products, and a commitment to education