Jet Fins - how far should one's heel protrude past the foot pocket?

Discussion in 'DIR' started by InTheDrink, Dec 8, 2008.

  1. InTheDrink

    InTheDrink Surface Interval Member

    # of Dives: 200 - 499
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    Nothing else to add really. I've bought some Ls and they seem small. But XL everything else is too big for me. So, just how far should the protrude in an ideal fit (wet boot in my case).

    TIA,
    J
     
  2. cinder4320

    cinder4320 Barracuda

    # of Dives: 100 - 199
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    The heel of my foot sticks out quite a bit. Much further than I'd actually like but that's the fin. I have small feet (7 womens) and am using the Large Jets. I've always felt like the foot pocket is not tall enough (its wide enough) to stick your foot in far enough.

    I originally bought the XL but my foot was then able to move side to side in the pocket. It was awkward, wasted energy, and made my foot really sore! Now I end up with dead space in the front and my heel sticking out but my kick ability is not affected.


    Miranda
     
  3. Sas

    Sas Orca

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    I recently got some and when I tried them on the shop person stood on the end and told me to wiggle my foot. The XL I could wiggle my foot around and the L was fine (I have smallish feet size 7 but bulky boots). Anyway, that is how I measured fit (I tried with my wetsuit boots and also my drysuit boots). Very comfortable to use in the water with both wettie + drysuit. My foot fits in up to my ankle. Can you find a place that will let you loan a few sizes to try out?
     
  4. TSandM

    TSandM Missed and loved by many.

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    It's not how much of your foot sticks out, it's whether the fin is stable on your foot, and whether it comes far enough back on the foot so that you can easily transmit force through it. Anything behind the heads of the metatarsals (ball of the foot) ought to be fine, as long as the fin is really solid on your foot.
     
  5. dumpsterDiver

    dumpsterDiver Scuba Instructor

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    Your toe needs to touch the front of the fin, if the boot is too large or the fin too small, the fin will be hanging on your toes and will feel like it is going to fall off when kicking. Some dive boots have wide thick soles and you might need to grind down the edge of the sole at the widest part of your foot (just a little) to allow total insertion of your foot. The sizing is often very dependent on the type of boot and sole used.

    You need to try the fins on with the specific boots that you will wear. I wear size 11 shoe and can wear L jet fins with a thin boot, with minimal sole. I prefer an XL fin for the larger blade rather than the larger foot pocket, so for the XL I need a boot with a more substantial sole, (but I still might need to grind it down a little on a bench grinder.).
     
  6. Tortuga68

    Tortuga68 Divemaster

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    I had the same problem (L too small, XL too big)

    As per dumpster's post above, the key is fitting your boot (rather than your foot) to the size (ie use a boot with a large, hard sole and XLs, or a boot with a a smaller/more flexible/ground down sole and Ls)

    This may mean changing the brand/style of boots you currently wear to ensure a nice fit (that's what I had to do)

    Probably not what you want to do (buy new boots) but worth it to get the right fit
     
  7. jagfish

    jagfish The man behind the fish ScubaBoard Supporter

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    Lots...if you are coming from a true full-foot support fin, your foot will feel naked as hell. I originally came from Avanti Quattros...

    You soon learn to take advantage of all that extra ankle play in your frog kick....
     
  8. DIR-Atlanta

    DIR-Atlanta SoCal DIR

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    Here's another recommendation for making sure that you choose the right bootie. I wear XL Jets, which fit the Turbo Soles on my drysuit perfectly. When diving wet (even in warm water), I use 5mm booties with a wide, flat sole, which also fit the fin quite well. I experience no excessive wiggling in the foot pocket with either configuration.
     
  9. Tortuga68

    Tortuga68 Divemaster

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    It may be worth mentioning that if you convert to spring heels (which I would recommend) of a good design, they will have cave line in them that limits the maximum heel protrusion - which may answer your question, indirectly
     
  10. DIR-Atlanta

    DIR-Atlanta SoCal DIR

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    Actually, I think the main purpose of the cave line is to prevent the springs from becoming over-extended and permanently stretched. It does also have the effect of limiting heel protrusion, though.
     
  11. Tortuga68

    Tortuga68 Divemaster

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    Same thing really, no?

    What I meant is that if your heel extends too far to fit with cave line springs then... You need a larger fin or larger springs!
     
  12. DIR-Atlanta

    DIR-Atlanta SoCal DIR

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    You're right - probably just semantics.
    On this point, we agree. :D
     
  13. InTheDrink

    InTheDrink Surface Interval Member

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    Thanks for all the posts - most useful. It sounds like my Jets (L) might be ok after all - just feel a bit naked after having fins that support nearly all the way down the hell.

    To ask a final question - here is a picture of my Jets squeezed on yesterday evening. Does this amount of protrusion seem normal? Increasingly I'm thinking yes. I'm unlikely to have the opportunity to try them out in the pool until after it's too late to exchange the size so I need to make my call now-ish. I will be getting spring straps so this may help also. Going to get Scubapro variety unless anyone has a better suggestion.

    Jetfins 001.jpg

    This look reasonable?
     
  14. Sas

    Sas Orca

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    A lot of people I know make their own. I dunno how to do this myself though :) - was going to look into it so I can put springs in my Jet Fins like my other fins.
     
  15. InTheDrink

    InTheDrink Surface Interval Member

    # of Dives: 200 - 499
    Location: UK, South Coast
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    I've spent a lot of time avoiding DIY on the off chance I might be good at it and get roped in for more. This originally applied to my house by I've extended the axiom to all aspects of my life: you can't be too careful.

    That said, if you find out how to do it, PM me, and I might try to do it in secret. Just don't tell anyone.

    J
     
  16. Plumb bob

    Plumb bob Nassau Grouper

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    I have customised the fit of my XXLs for use with my DS as I found the pocket just too big, I put a thick strip of rubber either side of the pocket and riveted them in with stainless rivets (big washer on either side as well to prevent the rivet pulling through). They fit perfectly now and only took a few minutes to do.

    My foot is in the pocket up to the start of my ankle which makes for a very precise and powerful feel.
     
  17. InTheDrink

    InTheDrink Surface Interval Member

    # of Dives: 200 - 499
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    No takers for how my foot looks in my JetFin then?
     
  18. DIR-Atlanta

    DIR-Atlanta SoCal DIR

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    That's about how mine look with 5mm booties. With my drysuit, I think the heels might stick even further out.

    The real issue is not how they look, but how they feel. If there is no slop in the foot pocket and you have all the control and mobility you need, then I wouldn't worry too much about how far the heel sticks out.
     
  19. dumpsterDiver

    dumpsterDiver Scuba Instructor

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    It is hard to tell from a picture, but I suspect that you have the heel strap too tight. You want the heel strap tight enough to still be comfortable and possibly allow the fin to wiggle slightly if, while sitting in a chair and kicking as wildly as possible the fin will begin to wobble a little on your toe. For normal kicking, the fin should be very stable.

    I know another person who lined their large rubber foot pocket with an extra layer of neoprene on the inside to enhance fit and comfort.
     
  20. Tortuga68

    Tortuga68 Divemaster

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    Yep! No problems there
     

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