Geoffwrote a review of Castelli Prosecco Ice Base Layer - Sleeveless - Men's on August 26, 2015
Familiarity: I've used it several times
I purchased the Core Mesh at the same time as this. The fit and cut is better then the Core Mesh. It has a lower neck line and a larger neck opening. Overall feel the Core Mesh does a better job keeping me cool and dry especially on the hotter days. That base layer is my go to for hotter and longer rides and the Ice is for shorter or cooler rides.
I think it does an ok job but the value and performance of the Core Mesh is better if you can stand the neck line and fit.