What Does Flatlock construction mean?

[Wayward Son]

On the 3/2 Pyrostretch, does that mean the seams are not glued?

I just bought the 7mm Pyrostretch & will dive it this weekend. it looks to be a very well made suit & an excellent value. I'm looking ahead to whenever I replace my current well aged 3/2, but a suit that has only stitched seams worries me.

 

[dumpsterDiver]

It is a flat seam and I beleive that the seams are very porous. It doesn't mean that the seam is weak...