Actually it was a quite simple operation. First, I tried which size would fit my head best from the standard sizes (S, M, L or XL). The shell is the same size, at least in the bigger sizes, and the fitment is made with padding thicknesses. Luckily I visited the factory because I would have otherwise ordered too small mask. I have quite thick cheeks which is why I had to go to XL instead of L.
After the first fitting, paddings were cut an glued to the empty shell. They are made of pieces so it is possible to add less or more padding to certain points according to the shape of your head. My head is apparently so symmetrical that it didn't require any special treatment. ? Only the cheek parts were made of slightly thinner material.
Then started the adjusting process. I put the mask on, we checked how it felt, took it off and Mr. Karvinen added extra pieces of padding to the points where the mask didn't fit firmly. This process was repeated as many times as it was needed and the result was the best fitting mask I have ever owned in my life.
Finally I got to decide if I wanted the ching sling or cup and the color and the model of the cage, stickers and straps. Mr. Karvinen also gave me a few extra sweat bands so i can try different versions.
The total operation took approximately 2 hours which included a short tour at the factory and presentations and stories from the history of Wall Masks. I must say that Mr. Karvinen is a first class gentleman and deserves A++ grade in customer service. This is one good reason why all of my masks have been made by him.