Rubber Strap $229 | Silver Spring Strap $299


Tech & Tips

Size Chart


Bio Fin Pro Series


Brand does matter!  Apollo Bio Fins are only split fins made from 100% natural rubber material.  The Bio Fin has proven to be a superior design for short and long distance water operations.  Its capability covers all aspects of military operations such as MCT (Maritime Counter Terrorism), MTO (Maritime Tactical Operations), MCM (Mine Counter Measures) and UBDR (Underwater Battle Damage Repair).


Operators prefer to use the Bio Fin Pro series because the natural rubber is negatively buoyant.  The flexibility of rubber increases thrust and reduces the risk of surface splashing.  If the operator is required to discard the fin, it will sink to the bottom so as not to alert the target of operators presence.  The design of the fin make it ideal for helicopter drops.


Independently voted the best overall fin in the world by Scuba Diving Magazine and the first choice of many Military Special Forces units worldwide.


  • Bio-Fin Pro Features Fully Adjustable Rubber Strap
  • Bio-Fin Pro C-Series Features Stainless Steel Spring Strap
  • 100% natural rubber blade and foot pocket
  • Eliminates muscle cramping
  • Low Strain 20º angled blade works with the natural resting angles of ankle and knee
  • Easy finning for all levels of fitness
  • Increased maximum speed, reduced fatigue
  • Up to 40% reduction in muscle fatigue, energy output and air consumption; longest recorded bottom times during testing
  • Open toe foot pocket for added comfort
  • Auto adjust silver stainless steel spring strap (C-Series Only)
  • Oversized rubber heel protector for easy on/off (C-Series Only)
  • New Size XL (March 2017)
  • Videos | Awards | Test Scores
  • Closeouts XT M, XT L & XT-C M

Paddle Fins = Power on down stroke only

Bio Fins = Power on up and down stroke

Split Fin Technology Bio Fins provide lift and propulsion with less effort and more power.  Unlike other fins which push water up and down, Bio Fin blades direct water flow over the leading and trailing edges to provide power, lift and forward thrust on each stroke.  Apollo launched the original split fin in 1998.  Over 15 years of rave reviews and awards, no other fin has beaten the consistently high scores awarded by Scuba Lab and Scuba Gear Reports.


Dare to compare.  Grab a copy of latest Scuba Lab review then click here to compare with previous Bio Fin scores and video reviews.

100% Natural Rubber - Only From Apollo Superior to any synthetic or hybrid material, Bio Fins are the only split fins made with 100% natural rubber.  Rubber can be a bit heavier to tote around in a dive bag than the plastics used for most fins but the comfort, flexibility and responsiveness while diving can't be beat.  Materials in design won Apollo Bio Fins over 9 awards since 1998 and is still used by testers as the fin to beat.

Ergonomic Design Apollo Bio Fins are designed with a 20º angle to accommodate a diver's natural tendency to bend slightly at the ankle and knee.  The angle is crucial to top performance and comfort.  The result is maximum propulsion with the least amount of stress on the body.  Apollo's choice of superior material and intelligent design provide divers with quick acceleration and the ultimate in power, speed and control.


Kicking It Wider kicks result in loss of momentum. Whether your cruising along or powering through current keep your kicks small.


Tips To keep spring strap hardware cosmetically appealing and easy to service, occasionally remove the screws for a quick brush and... More Care Info

536 mm

560 mm

560 mm

560 mm

585 mm

585 mm

585 mm

2200 g

2776 g

2910 g

2910 g

2950 g

2950 g

2950 g

222 mm

234 mm

234 mm

234 mm

234 mm

234 mm

234 mm

Fin                    Shoe Size      Shoe Size       *Length             *Width              *Weight

Size                  Men                Women            Per Fin             Per Fin             Pair






XL 325

XL 350

 7~  8

 8~  9

 9~ 11

11~ 13

12~ 14

12~ 13

13~ 14

 7~   8

 9~  10

10~ 11

11 ~ 13




Size chart is intended as a guideline. Actual fit may vary.  Recommendation is based on use of 5 mm boot with average sole.  If you are in between sizes and have a wider foot or thicker soled boot we recommend selecting the larger size.   *Weight and dimensions approximate based on black fins with rubber strap.


Customize Fit:  C-series fins are stocked and offered with a specific spring strap length. For example, size L is offered with a 300 mm spring.  If you prefer a more customized fit, springs are available to purchase separately in 250 - 350 mm.  See Fin Accessories and Spares for more info.

NSN 4220-66-152-2592  Apollo Bio Fin Pro XS, S, M, L, LL, Black


NSN 4220-66-152-2668  Apollo Bio Fin XT M, L, Dark Grey

Spare Rubber Strap (Rubber Strap Is Standard on Bio Fin Pro) NSN 4220-98-207-1008, Strap Assembly, Rubber (1) with male/female buckles

Stainless Steel Spring Strap (Spring Straps Are Standard on Bio Fin Pro C-Series) Available in Silver 250, 275, 300, 325  and 350 mm. Suitable for use with all Apollo spring strap kits and with spring straps installed.  Sold as set. $30 Pair

Stainless Steel Spring Strap Kits suitable for use with any brand fins.  Same as pre-installed on Bio Fin Pro C-Series.

Stainless Steel Springs Black 275, 300, 325  and 350 mm. Suitable for use with all Apollo spring strap kits and fins with spring straps installed.  Item sold as pair, includes black plates. Call to order $45 Pair

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