Seac Shout S700 Long Freediving and Spearfishing Fins

Open-heel fins have an adjustable heel strap and are worn with dive boots, which protect your feet on shore entries and add warmth. Full-foot fins slip on like a shoe against bare skin or a thin sock, and are typically lighter and easier to pack. Most scuba divers choose open-heel fins with boots, while full-foot fins suit warm water, snorkeling, and pool use.

Open-heel fins should be sized around the boots you will actually wear, snug with the strap set so your heel stays seated and your foot does not slide forward in the pocket. Full-foot fins should fit like a firm shoe, with no heel lift, no pinched toes, and no gap that lets water pump in and out. Too loose causes heel blisters and lost fins in current, and too tight causes foot cramps.

Choose your boots first and size open-heel fins around them, because sole thickness changes the foot-pocket size you need. A thin warm-water boot and a thick cold-water boot with a rugged sole can easily be a fin size apart. If you already own fins, bring them along when you buy boots so you can check the combination.

Spring straps replace the adjustable rubber strap with a stainless spring that stretches on and off, so there is nothing to buckle with cold or gloved hands and no rubber strap to perish and snap mid-dive. They hold constant tension, which many divers find more comfortable and consistent. They are sized rather than adjustable, so match the length to your foot pocket and the boots you dive.

For travel, length and weight matter most, so shorter blades and travel-specific open-heel or full-foot models pack more easily and save baggage allowance. Some fins have removable blades or compact foot pockets designed for luggage. Pack fins along the outside walls of your bag, where they also act as protection for softer gear.

Paddle fins use a solid blade that transfers power directly, which many divers prefer for precision, control in current, and non-flutter kicks such as the frog kick. Split fins have a slit down the blade that lets water pass through, which generally makes flutter kicking easier on the legs but gives up some control and works less well with other kick styles. Neither is inherently better, so let your kick style, leg strength, and conditions decide, and try both if you get the chance.

Rinse them in fresh water after each dive day, paying attention to buckles, springs, and strap channels where salt collects, and dry them out of direct sunlight. Store them flat or hanging from the foot pocket rather than standing on the blade tips, which can take a permanent bend. Check straps, buckles, and any screws before every trip, since a failed buckle is the most common fin problem.

The closed foot pocket is designed to be worn with 2.5mm neoprene socks, and when using socks of this thickness, Seac recommends choosing your regular everyday shoe size rather than sizing up or down. If you typically wear thicker or thinner socks, try the fins on with the socks you plan to dive in before committing to a size.

The 22° angle between the foot pocket and blade is designed to maximize thrust on each kick while reducing fatigue in the legs and ankles during long freediving, apnea, or spearfishing sessions. Combined with the flexible blade material, it is built to keep kicks efficient over extended time in the water.

It comes in Black, Camo Green, Camo Grey, Camo Blue, and Blue Camo; sizes run 36/38 to 47/48 but vary by color. Availability by specific color and size can vary, so check current stock or contact DiveCatalog.com for the combination you want.

The closed, full-foot pocket is specifically designed to be worn with 2.5mm neoprene socks, and sizing guidance is based on that sock thickness. Sizing guidance is based on 2.5mm neoprene socks, so wear them with socks of that thickness for the intended fit.