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K4 Fins / Surf-SUP wave rear fins

Surf-SUP wave rear fins


We’ve had a unanimous thumbs up for the K4 Fins SUP surf fins; from the Bluesmiths team using them in Maui perfection, to the likes of big wave ripper Finn Mullen in Ireland, through to those in the UK having their first experience of Stand Up Paddling with Loco-SUP and of course our k4 team riders.

We’re excited to bring you a substantial range of sizes in the K4 shop to tune your board for every wave. Our rear fins are available in 10,12 and 13cm in both FCS and Futures.

Sold as singles for £9 each.

Front asymmetric fins are available here:

SURF fronts

You can also select large sized rear US or SURF box fins in a choice of Stubby or Flex in the fin shop.

US Flex rears

US Stubby rears




K4 Fins rear SUP surf fins are available in 10,12 and 13cm in both FCS and Futures.

Additional information


14cm, 13cm, 12cm, 10cm


FCS, Futures


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