Two jackets hang in the locker of a 26-foot cabin cruiser on the same August afternoon. One is a slim inflatable harness that its wearer forgets about within minutes; the other is a bulky foam vest that keeps catching on the backstay. Both will float a person. They are not interchangeable, and choosing between them has less to do with brand loyalty than with how you actually use the boat.
How Each Jacket Actually Keeps You Afloat
Foam jackets rely on closed-cell foam sealed inside a fabric shell. The buoyancy is built in and permanent. There is nothing to fire, nothing to remember, nothing to rearm. Put it on and it floats you, whether you are conscious, injured, or already in the water when the boat turns.
An inflatable is, until it fires, little more than a harness. A folded bladder sits behind a cover, connected to a CO2 cylinder. The inflator punctures the cylinder and the jacket fills in a couple of seconds. Most coastal models are rated around 150 newtons; heavier offshore versions reach 275. An oral tube lets you top up by mouth, and it works even with a spent cylinder.
Automatic versus manual inflation
An automatic inflator fires when it senses water, usually through a dissolving bobbin or a hydrostatic sensor. Hydrostatic models are less likely to fire from spray, rain or a wave over the bow, because they react to being submerged rather than merely getting wet. Manual jackets inflate only when you pull the handle, which suits confident swimmers in sheltered water and paddlers who are in and out of the sea. For most coastal cruisers, automatic is the sensible default.
Comfort and Wearability on Deck
This is where inflatables win, and it is why so many sailors wear them without complaint. A folded inflatable sits close to the body, leaves your arms free, and does not turn the helm seat into a sauna. On a long afternoon of tacking, that difference decides whether the jacket stays on or ends up on the cabin sole.
Foam is bulky and warm, but it never needs a cylinder, can be worn in the water for hours, and can be handed to a nervous guest without explaining a handle. For dinghy sailing, paddleboarding and running the tender, the bulk is a fair trade.
Fit matters more than the category. Try any jacket on over the layers you really wear, then sit down, raise your arms overhead, and see whether the front panel rides up towards your chin. A jacket that lifts will not hold your head clear of the water. Adjust the side straps snug, and use the crotch strap — the accessory most often left in the bag and most responsible for keeping an inflated jacket from sliding up around your ears.
Buoyancy and Behaviour in the Water
Foam flotation is immediate. Step off the transom and you float, with no second of wondering whether the jacket will fire. Foam also tends to keep an unconscious wearer's face clear of the water, which is why it remains the standard for children, weak swimmers and anyone who might not be able to pull a handle.
An inflated jacket turns you face-up and holds your head higher, and 150-newton models do it with less bulk than foam of similar rating. Add a spray hood to keep water out of your face in a chop, a lifting loop so a crewmate can haul you out, and a light and whistle for being found after dusk. Those features exist on foam jackets too, so check for them on both.
Do not test either design in real conditions. Practise in a pool or in shallow water on a warm day with the boat nearby: learn how the jacket floats you, how to deflate it, and how to climb back aboard wearing it.
Maintenance and Inspection
Neither design is maintenance-free, but the work is different. Foam fails slowly: stitching rots, fabric fades, and foam loses resilience after years of sun and compression. Inflatables fail suddenly if a cylinder is loose, a bobbin is spent, or a bladder has a slow leak.
Foam checks
- Look for tears, frayed webbing and stitching that has pulled.
- Squeeze the foam through the shell and feel for stiffness, crumbling or flat spots.
- Confirm the zip and buckle still close firmly.
- Rinse in fresh water after saltwater use and dry out of direct sun.
- Replace rather than repair once the foam is compressed or the shell is worn through.
Inflatable checks, before every trip
- Check the status indicator on the inflator; green means the cylinder is properly screwed in.
- Heft the cylinder — a fired or partly discharged one feels light.
- Note the bobbin or sensor date and replace it on schedule.
- Inflate orally, leave it overnight, and see whether it holds; a slow leak shows by morning.
- Check the oral valve, the cover fastening and the retro-reflective tape.
Rearming Costs and Long-Term Ownership
Foam jackets cost once. Inflatables cost again every time they fire, whether that is a genuine emergency, a wave over the bow, or a crew member pulling the toggle to see what happens. Rearming kits are consumables, and bobbin or sensor schedules vary by model, so read the manual and write the date inside the cover.
Over several seasons, an inflatable's rearming and servicing add up; foam has no equivalent line item. Weigh that against the fact that a comfortable inflatable is worn all day and an unworn jacket of any kind is worth nothing. The cheapest jacket that stays in the locker is a bad bargain.
Matching the Jacket to Your Coastal Boating
Inshore boats, tenders and paddlecraft
Foam, almost always. You are likely to get wet, you may be in and out of the water, and an accidental inflation at the wrong moment is a nuisance at best. A snug foam vest with a collar is the practical choice.
Sailboats and cabin cruisers on coastal passages
Automatic inflatables, worn all day and combined with a harness and tether where the conditions call for it. Choose a spray hood and a lifting loop, and keep a spare foam jacket aboard for guests.
Children, non-swimmers and first-timers
Foam, fitted to their weight, with a collar that supports the head. Check that a child can sit, move, and be lifted by the grab handle. Never fit an adult inflatable to a child who cannot operate it. Carriage requirements and approvals vary between countries and waters, so check the rules that apply to you before you set off.
Cold water and exposed coastlines
Step up to a 275-newton inflatable with a spray hood, or a high-rated foam jacket, and carry a means of calling for help on your person rather than in a pocket that floods.
Before You Buy: A Short Checklist
- Try it on with your sailing layers, seated and with arms raised.
- Confirm the rating suits your conditions and carries the approval your country requires.
- Insist on a crotch strap, a lifting loop, reflective tape and a place to clip a light.
- For inflatables, check that rearming kits are easy to buy locally and note the service schedule.
- Plan for the spare: one foam jacket for guests costs little and covers most surprises.
Buy for the day you will actually wear it. If you sail from a cockpit and forget you have it on, an inflatable earns its rearming costs. If you are in and out of a dinghy, knee-deep at the slip, or handing jackets to people who have never seen a toggle, foam is still the honest answer. Most well-found coastal boats end up carrying a few of each, and nobody aboard complains about the mix.
Photo: 99pixel / Pixabay
