Thickness - 5mm torso and legs, 3mm arms. For example, the slick outer surface of the Steamer seals against the slick inner surface of the jacket. The collar is a good overlapping one, with wide adjustability. The seal itself is a narrow half-inch hem seal, but the collar fits tighter than most. The zipper is well-sealed with a wide slick flap.
Wrists also have hem seals.
Ankle seals are missing, but the ankles have sealed zippers. Compression resistance is above average. Stitching is above average at 10 per inch. Pro - Good collar and zipper seals, slick outer torso. Con - Nothing significant.