Booster swim fins are ideal for swimmers learning to swim. Made of a natural rubber that floats, Booster fins help lift legs to the surface and teach proper body position. The open-toe design on the underside of the fins prevents feet from chafing and provides the most comfortable fit. Features PERFECT FOR AQUATIC KIDS: Designed to accommodate young swimmers as they transition out of FINIS Fishtail 2 swim fins FASHIONED TO BE SUPER COMFORTABLE: Open-toe design on the fins' underside prevents chafing and ensures a comfortable fit HELPS TEACH SWIMMING TECHNIQUE: Promotes extension of legs to develop proper body position INTUITIVE LEARNING PROCESS: Feedback from the fins themselves teaches swimmers how kicking generates forward movement through the water SEE SIZING GUIDE FOR PROPER FIT: Users with wide or high-arched feet may prefer to size up