Giro Aries Spherical Helmet Review 2026: Premium MIPS Protection at Half Price
The Giro Aries Spherical is Giro’s current flagship road cycling helmet, replacing the well-regarded Aether with a refined take on the MIPS Spherical safety system. At the time of writing, Tredz has it at £139.99 — down from an RRP of £299.99 — making this one of the best-value premium helmets available. If you’ve been putting off upgrading your lid, this is a compelling moment to act.
What to Look For in a Triathlon Training Helmet
For training rides and draft-legal racing, you want ventilation, comfort and proven safety technology over pure aerodynamics. An aero TT helmet suits a 40km time trial; a ventilated road helmet is the better choice for hot summer training blocks, club rides, and draft-legal Olympic-distance races where overheating affects run performance.
Giro Aries Spherical: Key Features
- MIPS Spherical system — the protection layer sits between two EPS foam shells, allowing independent rotation on impact to reduce rotational force transferred to the brain. Giro’s most advanced MIPS implementation.
- Roc Loc Air fit — tool-free adjustment dial at the rear with three-way tuning. Stays put across long bike legs without pressure points or hot spots.
- Road-optimised ventilation — open vents with internal airflow channels move air efficiently across your head. Significantly cooler than TT helmets in summer conditions.
- Lightweight construction — the Aries prioritises ventilation and comfort over raw weight, but remains light enough for all-day wear. Full spec available at tredz.co.uk.
Who Is It For?
The Aries Spherical is the right helmet for triathlon training rides, draft-legal races, club sportives and long-course events in warm conditions. If you mostly race non-drafting 70.3s or Ironman, and you want an aero lid for race day, pair this with a TT helmet and use the Aries for all the training miles in between. At under £140, this is genuinely premium protection at a training-helmet price point.
Our Verdict
MIPS Spherical is the most advanced rotational protection system on the market, and the Aries delivers it in a well-ventilated road package. The £139.99 price on Tredz is exceptional value for a helmet that would cost you three times that at full retail.
Buying Tips
- Helmets should be replaced every 3–5 years or immediately after any significant impact — even if there’s no visible damage.
- Try before you buy if you can: head shape varies and no fit system compensates for the wrong shell geometry.
- The Aries is a road training helmet, not a TT aero lid. For non-drafting time trials, the best aero helmets for triathlon covers TT-specific options.
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