What Are Scuba Fin Blade Materials: Rubber, Composite, and Carbon Explained When I first started building my dive kit piece by piece, I honestly didn't think scuba fin materials mattered all that much. A fin's a fin, right? Wrong. After cramping up on a drift dive in Cozumel with borrowed rubber fins and then trying a friend's carbon fiber pair that felt like an entirely different experience, I realized the blade material completely changes how your fins perform underwater. Understanding scuba fin materials helps you pick fins that match your diving style, your leg strength, and the kind of diving you do most—whether that's lazy reef cruising or fighting currents in channels. What Are Scuba Fin Blade Materials? Scuba fin materials refer to the specific compounds and construction methods used to make the blade portion of your fins—the part that ...