Speedo fins speedo biofuse training fin arctic glass volcanic orange add speed, power, and ankle mobility to every training session. Add speed and power to your workout with the speedo biofuse training fin. Wear these comfy training fins when you need easy speed during technique drills or want to work harder in the pool. The extra propulsion helps develop ankle mobility whilst the added water resistance challenges the lower body, improving strength and endurance. Made from 100% silicone for excellent comfort throughout your session. Train harder. Move faster. Build real strength. 100% Silicone technique drills ankle mobility leg strength extra propulsion training essential 3 key features excellent silicone comfort constructed from 100% silicone, the biofuse training fin delivers a soft, flexible fit that sits comfortably on the foot throughout extended pool sessions. Silicone retains its shape and softness even with regular chlorinated water exposure. There is no break-in period, so you can focus entirely on your swimming. Strengthen leg muscles the added water resistance increases the workload on your leg muscles directly, improving both strength and endurance over time. Training regularly with fins builds the kind of lower body power that transfers into faster, more efficient kicking without fins. They are particularly effective for kick-set drills and intervals targeting the quads, hamstrings, and glutes. Increase workout speed the fin blade adds extra propulsion to th...