Overview
"A twin fin that you can push harder, turn tighter, and surf more vertically" - Britt Merrick
Bridging the gap between the CI Keel and AM Twin - this high area twin fin provides the drive and hold you expect from a keel, with the pivot and release found in the upright AM twin template.
Placing itself in the middle of the CI family, the BM template has a swept-back long leading edge that leads into a fully rounded tip. Different from other twin templates, this fin is designed to feel secure when laying into a longer turn or driving hard off the bottom.
With the CI Twin Pin/CI Mid in mind, the idea was to help anchor the tail to the wave face so surfers could take a more aggressive approach to ride a twin fin.
- Highest area twin set in the FCS range.
- The low sweep (rake) and narrow tip means these fins pivot and release exceptionally well while maintaining incredible trim speed and the ability to quickly break into a turn.
Board Types
- Designed to fit the FCS II Fin System.
- Recommended for all board types including fish, funboard and twin fin boards.
Large - Extra Large (One size suits all)
New Sizing for Specialty Fins
S-M: (Under 75Kg / Under 143 Lbs)
M-L: (70Kg - 90Kg / 132 - 187 Lbs)
L-XL: (Above 85Kg / Above - 176 Lbs)
You may notice new size ratings for our Specialty Fin Range. Previously, all Specialty Series fins were rated an XL. To better reflect fin sizing, we now have 3 new size categories:S-M, M-L, and L-XL.
Please refer to the Size/Fin Data tab on the product page to compare dimensions, or alternatively, you can find more information on the FCS Fin Data Page
| Fin |
Base (inches) |
Base (mm) |
Depth (inches) |
Depth (mm) |
Area (inches) |
Area (mm) |
Sweep Deg° |
Foil |
| L/XL | 5.66 | 143.7 | 5.41 | 137.4 | 23.24 | 14991 | 35.2° | Flat |




