Mats Bengtsson kayaking and kayak techniques

How to enlarge a neck rubber seal on a dry suit

Mats Bengtsson mib over the years

How to enlarge a neck rubber seal on a dry suit

Already in the store, I knew that I had to do something about the neck rubber seal. When my drysuit arrived, I read the information written by the vendor (Kokatat) regarding how to handle the neck. I then read on google about it. The two options that I found was:

  • Enlarge the neck by cutting of a piece of the rubber.
    • To make this easier, the rubber seal has a lot of rings marked on it. If you make a very even cut, of the right size, you have a larger rubber seal that will be as trustable as the original one, only larger.
  • Enlarge the neck rubber seal by forcing it around something larger than your throat for a longer time (like half a day or more).

I did not like the idea of making cuts in my brand new and way to expensive drysuit. Thus, I went for the idea of threading it over somethinglarge than my neck.

Enlarging drysuit rubber seal by threading it over a bucket

We looked in the kitchen for suitable bowls and pots. The best thing we could find seemed to be a rather hard plastic bucket from the wash room. By turning it upside down and thread the rubber neck over it, the neck would be quite well extended. In the information material was information about how much the neck was allowed to be extended. The bucket exceeded that with only a slight margin. But the bucket was having some edges. So we took a towel and placed over the bucket which was then placed upside down. Then we threaded the drysuit rubber neck over the combination of towel and bucket.

Threading the rubber neck over the bucket was a little daunting. It can stretch well, but it had to be pressed quite hard in order to stretch it far enought to fit over the bucket. It was very good to do this together. With four hands, and spreading the rubber with the hands pulling from inside the neck, the job was done in a way that did not carry any large risk of tearing the rubber seal.

The dry suit material is gore-tex, and is not expandable. So the way to get the seal over the bucket is to turn the drysuit outside in, and then first thread the top of the neck seal over the bucket. The part of the rubber seal closest to the gore-tex material is thus not threaded over the bucket at all, but it is so much larger than the neck that it does not matter.

Enlarging had to be repeated a number of times

After the first night, the neck still felt way to snug when testing it. So the neck went back over the bucket also the next night. After that, the size of the rubber neck felt ok, but we could not do any kayak paddling for a couple of days. The day before we were planning to get our kayaks out to paddle, I tested the dry suit again, and again it had shrunk back a little. Thus the rubber neck spent yet another day over the bucket.

After these first three nights, the neck felt comfortable, and I wore the drysuit during a paddle tour of a couple of hours. It did not feel comfortable, but I could breathe and transfer oxygen through the veins, so it was not too tight.

After yet another night over the bucket, and a couple of more paddling sessions, the neck felt very comfortable. I have used it many times since then, and never again had the need to place it over the bucket. It is still fitting tight enough around the neck, but there is very little pressure, the rubber just fits, it does not press.


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