The helmet isn’t the product. The platform is.
Ask most people what a tactical helmet is for, and they’ll say the same thing: stopping something dangerous from hitting your head. That’s true for a ballistic helmet. It’s not the whole truth for a bump helmet.
A US Navy SWCC close-quarters-tactics instructor ran students through the Galvion Caiman® Bump and reported something worth noting: no tension headaches after an hour under a headset, and no NVG counterweights needed at all.
We dug into the spec sheet to see what’s behind that: the shell material, the fit system, and the full weight breakdown by size.
The trade
Alongside the ballistic Caiman variants (UL, SAR, TL) sits the Caiman Bump: a separate product within the same platform, built with an advanced reinforced polymer shell instead of a ballistic core.
On paper, that reads like a downgrade. In practice, it’s a different tool for a different threat: blunt impact, not ballistics. Engineered specifically for the rigours of maritime and mobile manoeuvres, not for stopping fragmentation or gunfire.
What “bump” actually means
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<<150G blunt impact protection @ 10 ft/s (3 m/s)
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2,03 mm shell thickness
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Areal density: 4,1 kg/m² (0,84 lbs/ft²)
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0,38 kg: medium shell weight
Built to EN 1385, the water-sports impact standard, alongside a modified and abbreviated version of the US Army’s impact protection standard, AR/PD 10-02. Also rated across a genuinely wide environmental range: ambient 21°C, extreme heat to 71°C, extreme cold to -51°C. This isn’t a helmet cutting corners. It’s a helmet engineered against a specific, deliberately different threat model than its ballistic siblings.
Weight & fit
Weight is the whole point. Here’s the full breakdown across all five sizes:
- Small (525-570 mm) – schell: 0,36 kg · system: 0,75 kg
- Medium (545-590 mm) – schell: 0,38 kg · system: 0,77 kg
- Large (570-610 mm) – schell: 0,41 kg · system: 0,81 kg
- X-Large (590-630 mm) – schell: 0,43 kg · system: 0,86 kg
- XX-Large (610-655 mm) – schell: 0,46 kg · system: 0,90 kg
System = painted shell, NVG shroud, rails, APEX Liner System and hook-and-loop. Weights indicated are nominal; actual weight may vary.
This means a scale of less than half a kilogram in each size, and a fully mission-ready system of under a kilogram. Five sizes instead of the usual two or three means that more operators actually get a scale that fits their head, rather than settling for what is available.
The fit comes from the APEX Suspension & Retention System, composed of four components:
✓ Fit band: infinitely adjustable via a dial mechanism, repositionable by height, and fully removable if a user prefers the liner without it.
✓ Retentie system: tensioners instead of loose straps, a height-adjustable nape pad specifically for NVG stability, and a leather-lined chin cup.
✓ Impact liner: a two-piece, full-coverage liner with modular crown pads, providing uniform coverage and simple field replacement.
✓ Comfort liner: removable, repositionable pads for a custom fit, with hygiene replacement kits available.
None of that is incidental. NVG stability and heat management are the two things that quietly determine whether a helmet gets worn correctly for twelve hours or gets loosened, shifted, or resented by hour three.
The field test
One US Navy SWCC close-quarters-tactics instructor put it simply after running students through a full field training exercise:
No counterweights needed isn’t a comfort footnote. It’s one less accessory to procure, one less thing to fit, one less point of failure on a system that’s already carrying enough.
“Almost everyone I know gets tension headaches after about an hour wearing a helmet with a headset. No issues with NVGs. We don’t even need counterweights with them because the helmet fits so well.”
The takeaway
Most of what a helmet does all day has nothing to do with stopping a bullet. It’s holding your night vision steady, keeping your headset seated, and not giving you a headache by hour three. Matching the shell to the actual threat of the day, whether that’s a training range or a maritime deck, isn’t a compromise. It’s the more disciplined engineering decision.
The Caiman Bump isn’t trying to be armour. It’s the light, well-fitting, endlessly mountable foundation underneath everything else an operator carries on their head.