Verdict
Head-to-head · Best Bike Helmets

Giro Aries Spherical vs Met Downtown Mips

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Met Downtown Mips comes out ahead by a narrow margin (4.5 vs 4.4). The gap is mostly about fit for purpose — read the strengths below before deciding.

Giro Aries Spherical
Ranked #5 in Best Bike Helmets
Giro Aries Spherical
8 sources1 derived$21.95as of Oct 2

The Giro Aries Spherical achieves Virginia Tech’s highest safety ranking across all categories, utilizing a dual-shell ball-and-socket design to mitigate rotational impact forces more effectively than standard liners. GearJunkie found the helmet offers best-in-class ventilation through twenty-four vents that manage heat efficiently during high-temperature rides, while Cyclist magazine noted its DryCore system channels sweat away from the eyes with an internal silicone bead in the brow pad. However, Cyclist magazine measured a weight of 282 grams for a size medium, making it heavier than some direct competitors despite its premium price point. The product fits riders prioritizing maximum safety and cooling performance who can accommodate the extra mass and higher cost, but those seeking ultralight options or flawless build quality should look elsewhere.

Strengths
  • — Virginia Tech independent safety lab ranked the Giro Aries as its #1 rated helmet across road, mountain bike, and urban categories.
  • — Spherical MIPS technology uses a dual-shell ball-and-socket design to mitigate rotational impact forces rather than relying on a standard plastic liner.
  • — GearJunkie found the helmet offers best-in-class ventilation with 24 vents that effectively manage heat during high-temperature rides.
Watch-outs
  • — Cyclist magazine noted a measured weight of 282 grams, making it heavier than some direct competitors despite its premium price point.
  • — The helmet is expensive.
Met Downtown Mips
Higher ratedRanked #4 in Best Bike Helmets
Met Downtown Mips
6 sourcesall derived$92.95as of Oct 2

The Met Downtown Mips offers strong safety credentials, having ranked among the least expensive helmets to make Virginia Tech’s top-25 list in 2023 according to nytimes. Its seventeen vents provide effective cooling, and robust sweat pads prevent the MIPS liner from snagging hair, making it versatile for hybrid commuters and drop-bar riders with a low-key aesthetic. However, the helmet is available in only two sizes, offering fewer fit options than competing picks, and its crash-replacement policy is good but not great compared to rivals like Trek. This model fits casual urban riders seeking affordable protection, while those requiring extensive size ranges or premium post-crash support should look elsewhere.

Strengths
  • — Virginia Tech Helmet Lab safety tests score well, ranking among the least expensive helmets to make the top-25 list in 2023
  • — Low-key style with a removable visor provides versatility for hybrid commuters and drop-bar road riders
  • — 17 vents move air through the helmet for effective ventilation
Watch-outs
  • — Available in only two sizes, which is fewer than competing picks
  • — Crash-replacement policy is described as good but not great compared to competitors like Trek

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Giro Aries Spherical

The Giro Aries Spherical offers superior ventilation with 24 vents compared to the Bell Formula's 19 and the Met Downtown's 17, making it cooler for hot rides. Its Spherical MIPS dual-shell design provides a different rotational impact mitigation approach than the standard MIPS liners found in the Smith Signal and Trek Velocis Mips.

Specs side-by-side

SpecGiro Aries SphericalMet Downtown Mips
Weight265g - 282g280 g
Ventilation2417
Safety TechnologySpherical MIPSMIPS-C2 Brain Protection System
Safety CertificationCE EN 1078CE; AS/NZS; US
Fit SystemRoc Loc 5+ AirSafe-T Twist 2
SizeS, M, LS/M, M/L
VisorIntegrated visorremovable visor
MaterialPlasticIn-mould polycarbonate
Shell Material—In-mould polycarbonate
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