Kevlar has very good tensile strength, but relatively poor compressive strength and moderate stiffness . Kevlar also has has good damage tolerance.
Carbon is very good in tension and compression has great stiffness.
Kevlar-Carbon can be interwoven to provide a material that has a better overall set of properties for whitewater boats than either Kevlar or Carbon alone. Relatively strong in tension and compression, high stiffness, and a relatively high damage tolerance. Kevlar also has has good damage tolerance. Carbon is very good in tension and compression has great stiffness. Relatively strong in tension and compression, high stiffness, and a relatively high damage tolerance.