Thank you very much
Perhaps finding the right material that allows good equalization of the ears
You do not need a mask for that. Just hold your nose and equalize. Sealing of the mask is important though.
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Thank you very much
Perhaps finding the right material that allows good equalization of the ears
First Japanese diving mask (1918) "near-fullface" maskView attachment 552201 View attachment 552205 View attachment 552207
I saw this the other day. I have not had a chance to check the validity, but found it interesting.
DW