Daniel M.wrote a review of Castelli Seamless Men's Sleeveless Base Layer - Men's on May 28, 2019
Familiarity: I've used it once or twice and have initial impressions
I have other cooling underlayers, but the mesh design and material in the Castelli work much better! The garment is quite stretchy, conforms to the body very well and is almost completely unnoticed when riding. After a warm hilly ride, my shorts were soaking, but my jersey and the Castelli mesh underlayer were almost completely dry.