As a quick backgrounder, the J/145 was a "follow-on" design to the famous offshore silver-winning speedster- the J/125. It was created as a request by J/Boats owners (most of whom started with the world-famous J/24) to have a "more comfortable" version of the J/125 for their family, while still having "cruise-ability".
Well, the specification for the J/145 was a bit O.T.T. (yes, over the top). Like the J/125, it was constructed of a combination of foam core and balsa core with a combination of carbon fiber layers, vacuum-infused in triple layers (outer skin, core, inner skin). That construction specification made for a robust, strong, lightweight, amazingly quick offshore racer/cruiser.
For those who have sailed J/145s, it's an "eye-opening" experience. No one expects what looks like a family cockpit, wheel-steered, cabin with opening ports, sailboat to have a PHRF rating of -15! Seriously?
Another shocker is the interior... a REAL navigation station, a REAL J-shaped galley (offshore friendly), and enough room to sail an offshore crew in seriously comfortable Ritz-Carlton/ Peninsula Hotel comfort fashion (at least by most offshore racer standards!).
Enjoy this YouTube video tour of a nicely appointed J/145 here by Scot Tempesta from Sailing Anarchy.