Originally Posted by
rosefarts
What do the tri guys wear?
Dedicated trisuits. They've gotten really good over the years.
These days mosty Castelli because they're the bomb in the summer (and when you consider that it replaces bibs and a jersey, and you can often get it on discount, it's not nearly as expensive as their typical kit), but I've done them in aliexpress kit and club kit (which is about the upper end of aliexpress quality) and it was fine.
Generally the padding is some very thin bit made out of something which isn't spongy... hard to describe it, but it works well enough for a full IM or more, and it doesn't take on water and is thin and small enough not to be a bother for running at all.
I actually often wear trisuits in the summer because at 37+ Celsius the wicking is excellent, and the fit of the Castelli trisuits is perfect (can just about zip it up, but then it surprisingly doesn't feel constricting at all, can forget you are wearing anything).