I use Frivannsliv optimale evo 7mm. As you can see i am thin as a match and the suit fits good. The suit is made for the Norway. Instead of nylon on it got superlycra on the outside of the suit. Superlycra is very flexible and got low water resistance compared to nylon. on other ting that is tailor made for Norwegian conditions is the hood, it got a nice fit to cover so you got les skinn touching the cold water. As you can see on the picture most of the forehead and chin is covered.
I have tried a few wetsuits that is not made for freediving before i got this one and always was cold. I was nervous buying this wetsuit one year ago in may 2016. Freediving got a big startup cost and i was scared i would not use the equipment if it was cold to dive. First dive and i was sold! And my underwater adventure started!