What's everyone's experience with the allowance for extra thick undersuits options? I'll be ordering my suit in the next month but am stumped on whether or not to pick this option. I'd say most of my diving will be done in Swiss lakes (4degrees to 16 degrees Celsius) with probably the occasional trip (Malta, Adriatic, Baltic etc). So overall a mix of conditions but mostly cold.
I did my drysuit course with a trilam rental last week and was diving with a synthetic base layer, 200g merino wool layer and no gravity sea lion undersuit. I was warm enough on the 50 min dive but the water was only 10 degrees and I wouldn't want to be colder than I was. The instructors wore a halo ar and j2 underneath and mentioned this was fine for them but would add a heated vest for any colder. Someone else did their drysuit cert in an Avatar with a bz400x and the undergarment didn't look that lofty and her suit also didn't look baggy without the undergarment.
So my questions are: can you fit a santi bz400 into a standard cut seaskin?
What about a tecline/pinnacle 490? (250 thinsulate with 200 fleece)
How baggy is the suit with the extra allowance, if I'm wearing a 150g thinsulate or 250g thinsulate (or halo Ar)?
I know this is subjective but how warm is a 250 thinsulate compared to let's say a halo AR?