The Seac Sub Shout Fin model is a long-blade fin designed to deliver optimal propulsion under all conditions. Foot pocket is made from thermoplastic rubber, highly prized for its comfort, and designed for use with a neoprene booty. Blade material: thermoplastic techno-polymer with a high modulus of elasticity. The special grey, brown, and green camouflage effect is achieved using ICS (injection color system) technology. Blade edge rails help focus water down the length of the blade for maximum propulsion on every fin kick. This full-foot non-vented blade fin has large heel tabs to aid in donning and doffing. Fins are Italian made and available in multiple sizes.