Speedo Biofuse Training Fin
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Dual-density training fin: a stiff blade on a soft foot pocket, with side rails for propulsion on both the up and down beat. Listed for front crawl, backstroke and butterfly kick drills.
Speedo's Biofuse Training Fin is the all-rounder here. Speedo describes a dual-density design that pairs a stiff blade with a soft foot pocket, and dual rails down each side of the fin that give propulsion on both the up and down beat of the kick, to help elongate the kick and improve technique and speed. Speedo's UK listing gives the material as 100% silicone, while its US listing describes natural rubber, so check the listing for your region. Retailers list it for front crawl, backstroke, and butterfly kick sets and drills, but not breaststroke. Good for mixed sets without changing fins between drills.
Pros
- Stiff blade on a soft foot pocket (dual density)
- Side rails for propulsion on both kick beats
- Covers freestyle, backstroke, and fly kick drills
Cons
- Material and blade length vary or are unstated by region — check the listing
We are Back In The Pool and Trying out some New Speedo Gear: Biofuse Training Fins
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