Bio-Fins Ranger


Bio Fin Ranger With Spring Strap is a lighter more compact tactical split fin made from 100% natural rubber material designed specifically for Military and SAR operations and are ideal for helicopter and parachute insertions.

  • Features

    • Wide foot pocket designed for use with amphibious and combat boots.  Also well suited for high profile over boots and divers with wider than average shoe size.
    • Tough 100% natural rubber provides exceptional maneuverability and explosive thrust
    • Dynamic split blade technology proven to reduce fatigue and maximize endurance
    • Secure stainless steel spring straps eliminate strap and lug breakage.  Easy to don and remove
    • Increase footwear options with alternate size spring sets
    • New adjustable rubber strap assembly available. Customized for use with Ranger fins
    • Manufactured In Japan
    • Special Order Only CALL for lead time
  • Split Fin Technology

    Bio-Fins provide lift and propulsion with less effort and more power.  Unlike other fins which push water up and down, the Bio-Fin blade directs water flow over the leading and trailing edges providing power, lift and forward thrust on each stroke.

  • Specifications






    Thick Sole Over Boot 10~12

    Amphibious & Military Footwear 8~10

    423 x 252mm, 1200g


    Thick Sole Over Boot 12~

    Amphibious & Military Footwear 10~**

    423 x 252mm, 1200g


    **Spring straps available in 275, 300, 325 and 350 mm to accommodate a broad range of sizes and boot types.  Size chart is intended as a guideline. Actual fit may vary.  Ranger foot pocket is significantly larger than pro fin series.  Actual weight per pair varies with choice of strap.

  • Tech & Care

    • A wider kick results in loss of momentum. Whether your traveling at cruise speed or powering through current keep your kicks small.   You will move quicker and more efficiently.
    • Rinse fins with fresh water after use. Store indoors.  Avoid extended exposure to extreme heat, cold, damp, dry and automotive exhaust.  Bio fins are not the same material as tires which are often a synthetic or hybrid.   Avoid UV and other protective sprays or lubricants.  These products often contain oils or other ingredients harmful to natural rubber.
    • Spring Straps are stainless but not stain proof.  To ensure hardware remains cosmetically appealing and easy to work with, we recommend occasional disassembly to rinse screw threads.  Baking soda helps remove any staining that may occur.
  • Accessories

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