Bio Fin Pro w/
Adjustable Rubber Strap
Bio Fin Pro C-Series w/
Stainless Steel Spring Strap
Rubber Heel Protector
Included w/ Spring Strap
Swap out spring length to increase fit range and footwear choices per fin size
Tech & Tips
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.
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 250, 275, 300, 325 & 350 mm. See Fin Accessories and Spares for more info.
Paddle Fins = Power on down stroke only
Bio Fins = Power on up and down stroke
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... Continued
NSN 4220-66-152-2592 Apollo Bio Fin Pro XS, S, M, L, Black
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
Bio Fin Pro (Rubber Strap) Click For Item Numbers
Bio Fin Pro C-Series (Spring Strap) Click For Item Numbers
S (Small) US Mens 7 ~ 8, Womens 7 ~ 8
Length: 536 mm, Width: 222 mm, Weight: 2300 ~ 2480 g
M (Medium) US Mens 8 ~ 9, Womens 9 ~ 10
Length: 560 mm, Width: 234 mm, Weight: 2750 ~ 2930 g
L (Large) US Mens 9 ~ 11, Womens 10 ~ 11
Length: 560 mm, Width: 234 mm, Weight: 2900 ~ 3080 g
LL (Large-Large) Colors: Size LL Retired
Length: 536 mm, Width: 2342 mm, Weight: 2900 ~ 3080 g
Wearing LL? Check Size marked on back of fin (L, LL or XL). Click Here To View Foot Pockets. Transition from L to LL is partial size with just few mm increase in height of pocket. Take a look at black keeper. The exposed area of keeper for L & LL is very similar. The new XL is a full size up with significantly bigger foot pocket than LL. The same keeper can be fully inserted in XL.
XL (Extra Large) NEW Size 12 ~ 14
Length: 585 mm, Width: 234 mm, Weight: 2950 ~ 3130 g
Fit: Weight and dimensions are approximate. Recommended size range is based on 5 mm boot with average sole. Actual fit may vary. Bio Fin w/ Rubber Strap (Pro) is fully adjustable and will provide maximum range of fit. Bio Fin w/ Spring Strap (Pro C-series) stocked with a specific spring strap length. For example, size L is stocked with a 300 mm spring. Springs are sold separately 250, 275, 300, 325 & 350 mm. See Fin Parts for more info.
Item Numbers By Model / Size: USA & [International Number]
Description: Bio Fin Pro Black W/ Rubber Strap (split fins)
Size S 150-81-80-000 , NSN 4220-66-152-2592
Size M 150-82-80-000 , NSN 4220-66-152-2592
Size L *150-84-80-000 , NSN 4220-66-152-2592
Size LL 150-85-80-000  Size LL Retired in 2016
Size XL 150-85-80-010  New Size
*98% Prime Vendor Order For Bio Fins: 150-84-80-000
Description: Bio Fin Pro C-Series Black W/ Silver Spring Strap (split fins)
Size S w/ 275mm Silver Spring 155-31-80-027, 155-31-80-250 
Size M w/ 300mm Silver Spring 155-32-80-030 
Size L w/ 300mm Silver Spring 155-34-80-030 
Size LL w/ 325mm Silver Spring 155-35-80-032 
Size XL w/ 325mm Silver Spring 155-35-80-232 
Size XL w/350mm Silver Spring 155-35-80-235 
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