Speedo Biofuse Black Swimming FlippersCompact and comfortable training fin featuring Speedo Biofuse technology. These Great looking fins from Speedo are designed to increase your speed through the water, increasing leg strength, stamina and ankle flexibility. As your speed in the water increases with these fins, there will be a greater importance on you to home in on the perfect technique with your lower body to produce the best results. 100% silicone construction for excellent comfort.