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Giro Manifest Spherical Helmet — Specs & Analysis
Manufacturer specifications, compared against every other safety gear in our database. We do not test gear in the field — we measure, verify, and compare.
Giro's Manifest uses their Spherical Technology, a ball-and-socket design powered by Mips. Two foam layers rotate independently to redirect rotational energy, which does away with the plastic slip plane of the original Mips design rather than the protection itself. The result is one of the lightest and best-ventilated trail helmets available.
Who Is the Giro Manifest Spherical Helmet Best For?
Riders who want top-tier protection and ventilation in a lightweight trail helmet. If that describes your riding style, the Manifest Spherical Helmet should be at the top of your shortlist. It sits in the Safety Gear category alongside 11 other products we track.
How It Compares
At 310g and $250, the Manifest Spherical Helmet is 239g heavier than the lightest option in this category (the Garmin Varia RTL515 Rear Radar at 71g). The most budget-friendly option is the Adventure Medical Kits Ultralight .5 First Aid Kit at $18.
The price-to-weight ratio comes in at $81 per 100g — a premium price point, but you're paying for quality, materials, and design that justify the investment for serious bikepackers.
What We Like
- +Spherical Technology rotational protection
- +Exceptionally well ventilated
- +Light at 310g for a trail helmet
- +Premium fit and finish
Watch Out For
- −Expensive at $250
- −Limited size adjustability within each size
- −Replacement pads can be hard to source
The Bottom Line
We haven't scored the Giro Manifest Spherical Helmet, and neither has anyone else we can cite. It's here for its verified specifications and dimensions, which is what the fit tools run on — a score is an editorial judgement, and we don't hand one out until someone has a basis for it. What this page can tell you is measured: 310g, $250, and how both sit against every other safety gear product we track.
The price and weight above have not yet been checked against the manufacturer's own page. We are working through the catalogue and saying so as we go, rather than letting silence imply otherwise.
Specifications and dimensions come from the sources listed above. Where a page draws on first-hand riding, it says so.
How it compares
Against the 12 safety gear products we hold published specs for.
At 310g the Manifest Spherical Helmet is lighter than 3 of 11 alternatives we track. The category median is 170g.
At $250 it undercuts 3 of 11 of them, against a median of $180. That works out at $81 per 100g — above the $65 median for safety gear products.
Weight and price come from published specifications. Cost per 100g is a blunt measure — it rewards light gear and says nothing about durability or whether the thing works — so treat it as one input, not a verdict.
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