I cut my hoodie to accomodate the shape of my mask, cause even if I fold the hoody over my mask movement under water still causes openings in the seal. To get the correct shape put on your hoody with the mask over it and draw the profile with a peice of chalk and then simply take out your scissors. Only problem is if you change your mask then the profile probably wont fit

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Dive safe and shoot straight
- Hénré -
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"Thinking is the hardest work there is, which is probably why so few engage in it"
- Henry Ford -