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Windsurf fin guide

Use this fin guide to help dial in your board for ultimate performance.

These ratings are to compare K4 Fins only. Our fins are lighter, looser and grippier than anything else on the market with test-winning performance. This fin guide will help you dial in your board for ultimate performance.

RELEASE/GRIP: This is a choice you have to make. Do you want to do huge wrapping gouging roundhouse cutbacks with ultimate grip, or would you rather the tail spun more easily into a Taka? Size choice will also affect release.

LOOSE/DIRECTIONAL: Again a personal preference as to wether you like your board to feel loose and skatey, or more directional and on rails or planted.

SNAP/CARVE: Snap and pivot for tight ‘in the pocket’ surfing, or carve for more drawn out turns on open faces. This is related to looseness/control but more to do with template than flex.

LOW DRIVE/HIGH DRIVE: Your immediate thought might be that the more drive the better, right?! Not always the case. Quite often on multifin boards you’ll find yourself flying up at the lip but without the ability to get the board turned, this is too much drive. Of course in slow low power waves and onshore winds drive is a good thing.

We have also compiled a SIZE GUIDE, TUNING GUIDE and FIN SPECIFICATION GUIDE to help you pick the right windsurf fins.



FANG Free-ride

fang CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Fang Free-ride fin. Our Super Stiff material was made for this fin! A fast and efficient foil for speed and upwind performance combined with a perfect flex character to add control on all points of sailing or around the corners.
Flex: STIFF!
Sizes: 30, 32, 34, 36, 38, 40cm Tuttle and Power Box heads.



3SW Freestyle-wave

3SW CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The 3SW Freestyle-wave fin. This fin is designed to take anything you throw at it! Waves, Freestyle, Bump and jump or just blasting fully powered, the 3SW has the power and control to not let you down. Plug one into your wave board for a boost in onshore slogging conditions.
Flex: STIFF.
Sizes: 20, 22, 24, 26, 28cm US and Power box heads.



ROCKET REAR (Dynamic Flex)

rocket CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
Almost like having slalom fins in your waveboard! Lift, drive and speed
for onshore conditions. Great for early planing and jumping. Also surprised us with their DTL performance in higher rockered boards but you’ll need to use your rails.
Flex: LOW
Sizes: 14.5, 15.5, 16.5, 17.5, 18.5, 20.5cm US SLOT heads. 16.5, 17.5, 18.5 and 20.5 available in POWERBOX.



FLEX REAR (Dynamic Flex)

flex CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
Our original fin for performance wave riding. Lots of flex for amazing grip and looseness on the wave. Raked template for control. Test winner. Crank this fin over as hard as you want in the most testing conditions. Will loosen up a ‘stiff’ board and perform particularly sweet as twin fins as they eliminate that unwanted top turn spin out. The first choice for beyond vertical radical riding.
Flex: HIGH
Sizes 13, 14, 15, 16, 17, 18, 19, 20cm. US and SLOT heads.



LEON REAR (Dynamic Flex)

Leon dynamic flex CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Leon Jamaer signature fin! Very low sweep and low tip area gives a lot of speed and looseness with very easy release when required. For those who want to ride ‘fast and loose’ and waft the tail, riding off the front foot as Leon does. Good lift and drive with the upright template and wide base.
Flex: MEDIUM.
Sizes 13, 14, 15, 16cm. US and SLOT heads.



LEON REAR (Super Stiff)

Leon stiff CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Leon Jamaer signature fin in super stiff! Much like the dynamic flex version but with almost g10-like stiffness. This gives the Leon ‘SS’ more drive, acceleration and directness at the expense of grip and looseness.
Flex: SUPER STIFF.
Sizes 13, 14, 15, 16cm. US and SLOT heads.



STUBBY REAR (Dynamic Flex)

stubby CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
Our lower aspect line of fins for riding. Great for heavier riders applying greater power in high wind and wanting more drive in low wind. Also suitable for lighter riders in onshore conditions (upsize) or for those wanting more ‘release’ to learn taka’s and other wave/freestyle moves (downsize). More grunt than a similar length Flex or Leon. A nice all rounder that works in all conditions and with all set ups.
Flex: MEDIUM
Sizes 12, 13, 14, 15, 16, 17, 18cm. US SLOT heads. 16 and 18 available in POWERBOX.



STUBBY FRONT (Dynamic Flex)

 stubby front CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
A great front fin choice for riders wanting maximum area and hold but not wishing to commit to the full on Ezzy asymmetric. Works well for all fin configurations. Also the best choice if you want to use very similar sized front and back fins (ie. 12 front, 14 rear thruster)
Flex: MEDIUM
Sizes 9, 10, 11, 12, 13cm. US, SLOT and MT heads.



STUBBY FRONT (Super stiff)

stubby front CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Super Stiff Stubby for that g10 type ride. More drive and directness at the expense of grip and looseness.
Flex: Super stiff.
Sizes 9, 10, 11, 12, 13cm. US, SLOT and MT heads.



SHARK FRONT (Dynamic Flex)

shark front CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
Our front fin for looseness and speed. If you’re getting all the grip and drive you need from the rear fins, this is a great front fin for loosening up your quad. Test winner.
Flex: MEDIUM
Sizes 6, 8, 10, 12cm. US, SLOT and MT heads.



SHARK FRONT (Super Stiff)

shark front CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Super Stiff version of the Shark. This stiffer version will feel more lively and direct under the front foot but with some compromise on looseness, grip and control. If you like instant acceleration and directness for jumping the super stiff is for you.
Flex: Super stiff.
Sizes 6, 8, 10, 12cm. US, SLOT and MT heads.



EZZY ASYMMETRIC (Dynamic Flex)

Ezzy CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The Ezzy Asymmetric fin! More power, more drive, more speed, less drag. This fin has a similer template to the Stubby but with an even wider base. Fully asymmetric foil with a radiused front and slightly positive inner foil to aid flow at high speeds. Choose a smaller fin size for less drag, same power. Great for huge gouging hooky cut backs.
Flex: Medium
Sizes 7, 8, 10, 12, 13, 14cm. US, MT and SLOT 1,2 or 3 degree toe.



ROCKET FRONT (Dynamic Flex)

front rocket CAD
RELEASE
GRIP
LOOSE
DIRECTIONAL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
The smaller rocket sizes are designed to be used as front tri/quad fins, or most importantly as rear trailer fins where the upright and non
swept template is ideal. Plenty of lift, speed and drive.
Flex: LOW
Sizes: 8, 10, 12, 13cm. US, SLOT and MT heads.



BUBBLE (Dynamic Flex)

Bubble CAD
RELEASE
GRIP
LOOSENESS
CONTROL
SNAP
CARVE
LOW DRIVE
HIGH DRIVE
Our Freestyle fin developed by Andy ‘Bubble’ Chambers. We originally had two very different prototypes; one worked great on flat water but would spin out in the chop, the other was rock solid in the chop but too
grippy on flatwater. The BUBBLE freestyle fin has the perfect blend of grip to be secure in the chop and into carving manuevres, whilst still allowing plenty of release for double spins.
Sizes 16, 17, 18, 19, 20, 22cm. US, SLOT and POWERBOX heads.

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