Aaron Bytendorpwrote a review of Castelli Competizione Bib Short - Men's on April 3, 2020
Familiarity: I've used it several times
I picked these up a few weeks ago in anticipation of the riding season and so far i'm pretty impressed! The KISS Air2 is breathable, and supportive without being too thick.
The material gives a good amount of compression so be aware of that when deciding on size. I went with an XL but XXL might have worked as well. I have yet to use them on a blistering hot summer day, but so far on the trainer and on rides I have found them to be plenty breathable. My only gripe is that the bib straps tend to bunch and twist easily, but they stay in place once you get a tight jersey on over the top.
Plan on sizing up a full size possibly two for Castelli as with most Italian brands.