Speedo Biofuse Fin Improve your upper body strength while working on your technique with this Elite Pullbuoy from Speedo. This red pullbuoy has an enhanced design for a more comfortable workout Product Features Made with Speedo Biofuse technology for maximum comfort & fit Engineered to increase speed through the water Improves leg strength & ankle flexibility Dual density design, offering stiff blade & soft comfortable foot pocket, size 11-12