Here's what I read on the Lift site about what they use to make them:
mast: "ours is composed of carbon fiber and Kevlar"
https://www.liftfoils.com/pages/foil-ma ... ion-design
Wing+fuselage: "Our wings are built with lots of carbon and Kevlar (known for its use in bulletproof vests) for maximum strength and toughness"
https://www.liftfoils.com/collections/p ... -one-piece
No word there about the core material. I'd love to know.
I ride a Horue foil which is wonderfully rigid and a very light weight foam core design (just under 3 pounds for the whole thing). I am careful to avoid smashing it into rocks. I'm sure it will not survive impacts like the war axe designs that others ride, but I love it's positive buoyancy. Attached to my converted skimboard the board+foil will rest on it's side. No need to grab a rail to get on strapless, great for dragging out and upwind to deep clear riding water, and the lack of weight can be felt in its agility.
I'm not writing all this to be a promo for Horue, but to give another perspective on core materials. I'm looking at picking up a 2nd foil. The Lift looks nice. The one piece fuselage/wing concept looks like a good design unless you want to be able to play around with stabilizer trim.
I think lighter is better & I accept the risk if I ram it into something bad. Kind of like deciding on the pros & cons of a truck or a sports car.