Friday, January 18, 2019
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C4-300 footpocket


New Member
Nov 6, 2018
Hong Kong
Was wondering myself. There's not much out there unfortunately.

Generally what I was able to establish is that they are comfortable with a sock (confirmed by two divers). They are NOT made of rubber but what seems to be a harder composite. Therefore the footpockets come with a shoe horn as it's not that that easy to get your foot in. They are said to be incredibly light weight. Heard opinions they are well suited for freediving but not so good for spear fishing due to their stiffness (that comes down to personal preference I guess).
If you search C4 300 on youtube there is a video where a guy puts them on. You can see how the material behaves and bends.

Will update when I hear more.


New Member
Oct 20, 2018
Northern California
... actually i just checked my old emails with alchemy. this blades ONLY fit the C4 300 pocket.

what makes them bad about spearfishing being stiff? like they are bad for many hours of surface swimming ?
Jan 2, 2004
Visit site
I bought a pair of c4 finns with 300 footpocket and they are sizewise correct size if using 3mm to 5mm socks in them. is easier to put on if socks have at least fabric on underside so easier to slide them on. size 42-43 is size 42 foot with 5mm socks fit.
I use a pair of smooth 6.5mm socks for Winter and i had to get a pair or bigger footpockets 44-45 for beeing possibl to use them with the finns. My foot is 265mm 42,5 euro size for reference.