| I know when I had mine fitted it took some getting used to.
When you put it on you want to fold the smoothskin exterior back in on itself so it is touching your neck. I like to fold a good half or so in so that I have a lot of neoprene in contact with the skin to get a lot of seal.
Quick way to test it is to put your drysuit on and empty out the air from your dump (time to double up) and just check none is finding its way out through the neck.
Not the best but I hope it helps
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