Used Scubapro Jet with Spring Heel Strap

The vented rubber design that made the Jet Fin famous is still the reason divers buy it: the vents decrease drag on the upstroke and boost thrust on the downstroke, and the 100% rubber construction is nearly indestructible — ScubaPro talks about a lifetime of use, and plenty of Jet Fins in service are decades old. That is why they remain the standard for technical, military, commercial, and cold-water divers.

Jet Fins are designed to be worn with dive boots, and ScubaPro's size chart sizes them by boot thickness — for example, a diver with a US men's 9 / EU 42 foot takes a Medium with 3mm boots but a Large with 5mm or drysuit boots. They will feel big on a bare foot; that is by design. Pick your size based on the boots you actually dive, and if you are between sizes, contact us with your foot size and boot type.

They sink — ScubaPro officially rates the Jet Fin's buoyancy as negative. Many drysuit and technical divers actually prefer that, because negatively buoyant fins help counteract floaty feet and keep your trim flat. If you want a travel-light fin that floats, look at ScubaPro's GO series or the Seawing Supernova instead.

This version comes with self-adjusting stainless steel spring straps — no buckles to fiddle with or rubber straps to snap; you just pull the heel spring on and it stays put with even tension. Weight is part of the Jet Fin deal: listed weights run from about 5.3 lbs per pair in Medium up to about 7.1 lbs in XL, which is why they are a favorite for local and cold-water diving more than for airline travel.

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.