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Please help with C4 400 Fin Pocket sizing

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.


New Member
Sep 6, 2021
Hi guys,

I have treated myself to a decent set of fins, C4 Fast 400 Blades and C4 400 pockets.

Since I could not find a local shop with stock of C4 400 pockets to try on I ordered online from Adreno.

I went initially went with the C4 400 Foot Pocket 44/45 (10-11) as I wear a 10-11 shoe however these feel pretty loose even with the 2mm socks i have on in most of the photos.

So I ordered the C4 400 Foot Pocket 42/43 (8.5-9) which feel a bit tight espiecially withg the 2mm socks on.

1) Do you think the slightly looser pockets would be better than the slightly lighter pockets? I could always get thicker socks?
2) Would the looser pockets have too much play to twist when kicking?
3) Do you think the tighter pockets will become uncomfortable and start hurting or will they streth a little over time?

I’m a bit lost here guys. I’ve watched some online vids showing 1 finger inside the pocket it good, 2 is too loose so I took some pics to see what you guys think.

Any help or advice would be much appreciated.



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