I don't think the design (which started from a Matrix 450 mold) did not incorporate carbon fibre. I don't know of any carbon being used in the layup/infusion, but I'll double check. One plus to the 444 is that everything in the boat is glassed in place; meaning no adhesive/caulking to hold in cabinet modules, so that adds a lot of strength throughout. If the bulkheads have to be made small in height anywhere to accommodate the design, carbon is often added to reinforce. The only carbon fibre I know of in the boat is: master cabin sliding door, steering wheel, some of the webbing that connects the solar arch arms to the roof. I'll update if I find out of anything else.