Military-Grade Fin

Following in the footsteps of the original IST F1 Rubber Rocket Fins, the F4 Propulsion Fins offer a rugged construction with performance in mind. The IST military fins are the #1 choice by the U.S. military for Navy SEAL and special ops training, and provide longlasting durability that meets the highest of standards.

Powerful Design

The short, wide blade offers plenty of propulsion while the comfortable open-foot pockets are designed to be worn with dive booties for durability and protection. Vented blades and jet-stream grooves channel water for serious power and maximum maneuverability.

Compact Style

The F4 adapted style is ideal for rescue and salvage divers who need extreme control in tight spaces. With a design that enhances agility and provides premium support, these fins are a must-have for professional-quality gear that you can depend on.

Open Foot Pocket: Designed to wear with dive bootiesSPECIALTY DESIGN — A curved, tapered blade with an open back designed to be worn with dive booties.SPECIALTY DESIGN — A curved, tapered blade with an open back designed to be worn with dive booties.SHORT BLADE — The same power and reliability as the original F1 Rubber Rocket in a compact style.EASY WEAR — Adjustable straps and quick-release buckles make donning and doffing easy.JET STYLE — Deep grooves and vented blades force water backwards for better propulsion.Open Foot Pocket — Designed to ear with dive booties