Size - I would so that the waist size on this is completely misleading.
I measured myself a size S on the waist and it was about 2 inches too big on the waist (not including the snowskirt). The snowskirt was to size, but the actual trouser waist is not.
I just used a belt in the end but everything else about them is accurate. Breathable and waterproof if you don't always fall on your bum when boarding.