Onyx A/M-24 Inflatable PFD Review — Low-Profile Safety with a Manual Backup
The Onyx A/M-24 is a sensible low-profile option when a boater wants automatic inflation with a manual-only backup. The fit range is broad and the inflated buoyancy is substantial, but it only works as intended when it is worn, inspected, and rearmed according to the label and owner manual.
By Sebastian · Published August 3, 2026 Research synthesis
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Research synthesis, not a life-jacket field test
This review compares Onyx’s product information with the Amazon listing checked on August 3, 2026. It is a research synthesis, not a claim that Cast & Cruise has worn this exact PFD through a full boating season. With safety gear, that distinction is important: the label, fit, inspection routine, and activity restrictions matter more than a pretty product photo.
Why the A/M-24 is appealing
The A/M-24 solves a familiar warm-weather problem. Traditional foam PFDs are dependable, but they can feel bulky when someone is casting, handling lines, or moving around a center console. The Onyx uses an inflatable profile and offers automatic inflation on immersion plus a manual pull-cord option.
The convertible design is the more interesting detail. Onyx says the jacket can be changed to manual-only with its conversion cap, which is useful for activities where spray or rain could otherwise trigger automatic inflation. That flexibility is practical, but only if the owner understands which mode is installed before leaving the dock.
The part that should not be skipped
An inflatable PFD is a system, not just a vest. The cylinder, indicator, oral inflation tube, pull handle, cover, and rearming kit all have to be in working order. Check the jacket before every outing and follow the owner’s manual for service and rearming. If the product is damaged, has been inflated, or has an expired component, it is not ready because it still looks fine on a hanger.
The fit also deserves a deliberate check. The cited listing describes a 30–52-inch chest range and use for people 16 and older and over 80 pounds. That does not make it a universal choice for every passenger, child, swimmer, or activity; a properly fitted, label-appropriate PFD is the actual requirement.
Who should buy it
- Buy it if: you want a lower-profile adult PFD for cruising or fishing and you are willing to inspect and maintain an inflatable system.
- Choose a different format if: you need a simple, always-buoyant option for a child, a non-swimmer, rough-water instruction, or an activity the label does not cover.
For a boater who will really wear it, the A/M-24 is more compelling than a bulky vest left in a locker. Just make the rearming kit and the pre-launch inspection part of the purchase decision.
If you are building out the rest of a small-boat safety kit, our Standard Horizon GX1400 review covers the fixed-mount VHF side of that decision.
Sources checked
This review is based on the sources below and is labeled by review type above. Product pricing and availability can change.
How we scored the Onyx A/M-24 Automatic/Manual Inflatable Life Jacket
| Criterion | Score |
|---|---|
| Inflation flexibility | 9.1 / 10 |
| Fit range | 8.9 / 10 |
| Low-profile comfort | 8.8 / 10 |
| Maintenance simplicity | 7.7 / 10 |
| Value | 8.5 / 10 |
| Overall | 8.8 |
What we liked
- +Automatic water-activated inflation with a manual pull-cord option
- +Convertible to manual-only mode when that is the better fit for the activity
- +Low-profile shape and adjustable 30–52-inch chest range
- +22.5 pounds of buoyancy when inflated, according to Onyx
Watch-outs
- –It is not a maintenance-free substitute for a correctly fitted foam PFD
- –The auto-inflation system needs inspection and the correct rearming kit
- –The inflatable format is not the right choice for every activity or wearer
Bottom line
This is the kind of PFD that makes sense for hot, active days when a bulky vest will stay in the truck. Buy it for the fit and inflation format, then treat the rearming kit and inspection routine as part of the product—not optional accessories.