read their description of the layup.
How well a composite layup performs depends on both the hull geometry and how the cloths are chosen to maintain that geometry, and to withstand abuse that threatens to break the boat.
There are many good layups, but the best for general whitewater is glass outside, Kevlar inside. Carbon can be used outside, where it saves weight and is stiffer than glass, but carbon does not resist abrasion as well as glass. With gelcoated sea kayaks, carbon is somewhat protected from abrasion, but some of the weight savings of carbon is lost with gelcoating.
Manufacturers sometimes break the "rules" with peculiar layups. I have a slalom c-1 that is S-glass outside, carbon inside. It has outstanding stiffness, important for the Olympic competitor who sold it to me, but it is not capable of withstanding an extreme crushing blow as would the same hull made with S-glass outside and Kevlar inside.
Full Size Sail Rig
PFD's (Life Jackets)
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