Boarderguy
Chief Narctopus Wrangler
Venting was exactly the same. I added 2lbs going from 150 to 250 and it seemed about right. I did not get room for thick undergarments and the 250 is on the verge of being too much. The arms are a bit restrictive with the thumb loops but were fine when I didn't use them.Did you notice any difference venting your suit with the thicker undergarment?