Engineered with Speedo Biofuse technology to perform in harmony with the body, these short fins can be used to improve lower body fitness, leg strength and ankle flexibility while maximising your speed in the water. Structured in the fin blade yet soft and comfortable in the foot pocket for enhanced performance and fit.Features:*Designed to perform in harmony with the body using BioFuse technology*Improves lower body fitness, leg strength and ankle flexibility*Increases speed of workout*100% Silicone construction for excellent comfort*Dual density design, offering stiff blade and soft comfortable foot pocket for a comfortable fit and enhanced performance