Carbon Fiber Free Diving Fins
Using carbon fiber as a material for freediving and spearfishing fins is highly suitable since it has several unique properties that make it extremely suitable for this purpose. It has an extremely high strength-to-volume ratio (which means that it is extremely strong for its size) and a very high strength-to-weight ratio.
The blade of a freediving fin made of high quality carbon fiber is extremely light weight, very hard, yet flexible when combined with the right resins.
Since carbon fiber has unique properties, carbon freediving fin blades can be bent relatively easily while diving underwater due to their unique properties. Carbon fiber material "wants" to return to its original shape after it has been bent, that is to be straight again, and it does so extremely quickly after it has been bent.