blue with rubber strap
yellow with spring strap
orange with spring strap
pink with spring strap
black with rubber strap


Strap Type | Rubber $229


Tech & Tips


Bio Fin Pro w/ Rubber Strap


Brand does matter!  Apollo Bio Fins are the original and only split fin made from 100% natural rubber.


  • Fully Adjustable Rubber 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
  • New Size XL Now Shipping
  • Videos | Awards | Test Scores
  • Closeouts Last Chance

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 Rinse fins with fresh water after use. Store indoors away from extreme heat, cold as well as automotive exhaust.  All of which can be harmful to the fins.  The fins aren't the same as typical automotive tires which are commonly made with synthetic or hybrid material rather than 100% natural rubber.  Avoid UV and other protective sprays or lubricants which often contain oils that will cause rubber to deteriorate.  To keep spring strap hardware cosmetically appealing and easy to service, occasionally remove the screws for a quick brush and ... More Care Info

Size Chart:  Bio Fin Pro (Rubber Strap)


XS (X-Small) US Mens 6 ~ 7, Womens 5 ~ 7

Colors:  Pink

Length:  504 mm, Width:  210 mm, Weight:  2000 g

Fit 3mm Boots:  ~ 24 cm

Fit 5mm Boots:  ~ 23 cm


S (Small) US Mens 7 ~ 8, Womens 7 ~ 8

Colors:  Black, Blue, Orange, Yellow, Pink

Length:  536 mm, Width:  222 mm, Weight:  2300 g

Fit 3mm Boots:  23 ~ 24 cm, Fit 5mm Boots:  24 ~ 26 cm


M (Medium) US Mens 8 ~ 9, Womens 9 ~ 10

Colors:  Black, Blue, Orange, Yellow, Pink, XT

Length:  560 mm, Width:  234 mm, Weight:  2750 g

Fit 3mm Boots:  24 ~ 27 cm, Fit 5mm Boots:  26 ~ 28 cm


L (Large) US Mens 9 ~ 11, Womens 10 ~ 11

Colors:  Black, Blue, Orange, Yellow, XT

Length:  560 mm, Width:  234 mm, Weight:  2900 g

Fit 3mm Boots:  26 ~ 29 cm, Fit 5mm Boots:  27 ~ 30 cm


LL (Large-Large) 11W+

Colors:  Size LL Retired

Length:  560 mm, Width:  234 mm, Weight:  2900 g

Wearing LL?  Check Size marked on back of fin (L, LL or XL).  Compare foot pockets.  Transition from L to LL is partial size with just few mm increase in height and width of pocket. XL is a full size up with significantly wider foot pocket than LL.


XL (Extra Large) Size 12 ~ 14

Colors:  Black (Now Shipping), Blue (Fall 2017)

Length:  585 mm, Width:  234 mm, Weight:  2950 g

Fit 5mm Boots:  29 cm ~


Weight and dimensions are approximate.  Actual fit may vary.  US Mens & Womens recommendation 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.  If you are in between sizes and have a narrow foot or thinner boot we recommend selecting the smaller size.  Rubber strap is fully adjustable and will provide maximum range of fit per size.


Apollo Dry Suits are sold with 5mm Boots 24 - 31 cm.

Phone 800.231.0909 425.290.9890 Fax 877.756.7240 E-mail | © 1996 - 2017 Apollo Sports USA Inc. All Rights Reserved