From the manufacturer's official website:

The T FI.Mille is the evolutionary successor to the legendary ProsLine T Campionissimo bib short. The T FI.Mille is designed to be your ideal long-distance comfort short.
Extra cushioned insert and less restrictive, anatomical, 4-panel, ASSOS AEPD II cut (fewer seams = less friction).
Featuring the newly developed ASSOS Type A.360 sensitive compression Spandex.
The heart of the FI.Mille is the redesigned Campionissimo insert made from 5 different textiles. Anatomically formed.
Featuring Elastic Interface technology.

For more information, please visit this product's webpage.