AJ, totally agree with you to check the athletes guide. As a point of reference, Lake Placid IM policy was that if it was wetsuit optional, and you chose to wear one, the would be a wetsuit wave that would start after the age group athletes entered the water. While your time doesn’t start until you cross the mat, you still have to finish by midnight. And by no means is a perfect example, and there are too many variables, I have swam 2 miles a few times without a wet suit. To mentally prepare in case I had to swim the distance without one. In those instances, I seem to swim my 100 yard pace about 10 seconds slower than I do in a wetsuit. There is no perfect answer.