• Welcome to the DeeperBlue.com Forums, the largest online community dedicated to Freediving, Scuba Diving and Spearfishing. To gain full access to the DeeperBlue.com Forums you must register for a free account. As a registered member you will be able to:

    • Join over 44,280+ fellow diving enthusiasts from around the world on this forum
    • Participate in and browse from over 516,210+ posts.
    • Communicate privately with other divers from around the world.
    • Post your own photos or view from 7,441+ user submitted images.
    • All this and much more...

    You can gain access to all this absolutely free when you register for an account, so sign up today!

Adapting fins to fit feet better

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
Jul 12, 2023
Hi All,
My girlfriend just bought some Sporasub Spitfire kelp fins. They seemed to fit fine. However after 30 mins in water, unbearable pressure points on the outside of here feet. My background is ski instructing and with our boots we would heat up and bend, or grind out the sore spots to make room. 1mm is massive in terms of foot comfort.
We're new to freediving and wondered if this is done much and if so how. I can't find much on google/YouTube.


  • Screenshot_20230717_211614_Chrome.jpg
    85.4 KB · Views: 94
  • Like
Reactions: Mr. X
Years ago I used a heat gun to change the fit of Pathos pockets. As I recall, I wore a thick pair of socks under my fin socks. Others have reported using a hair dryer and one guy said he submerged his foot in very hot water. Anyway, the heat gun worked for me.
Last edited:
Yup ^^ I doubled up on socks and used the heat gun on low to soften the rubber. Let cool and remove. Just make sure to mark "Left" and "Right" on the foot pockets as they'll be formed to your feet.
Same here, with my Cetma S-Wing pockets, I had spots that were making my foot ache. I put double socks on, used a heat gun and formed and stretched my pocket out a bit. No issues since. Just remember to do this in small increments as you can't shrink the pocket back down.
I also labelled them for my left and right foot.
DeeperBlue.com - The Worlds Largest Community Dedicated To Freediving, Scuba Diving and Spearfishing


ISSN 1469-865X | Copyright © 1996 - 2024 deeperblue.net limited.

DeeperBlue.com is the World's Largest Community dedicated to Freediving, Scuba Diving, Ocean Advocacy and Diving Travel.

We've been dedicated to bringing you the freshest news, features and discussions from around the underwater world since 1996.