Deep internal channels align with the large frontal vents to rush cooling air across your cranium, and the horizontal brow vents do a fine job of managing sweat and drying the front pad. It's very good for glasses storage when not wearing them too. Zero RH+ Z Alpha MIPS Our proprietary Super Fit™ sizing system is based on “human scale factors” data and over 25 years of handcrafting helmets. By creating helmet moulds in up to 4 adult sizes to match the human body’s form, our Super Fit™ sizes comfortably and securely fit riders, and feel like they are custom made just for you. With its sweeping, almost conventional shape, and 22 sizeable vents, the Z Alpha looks very open for an aero helmet. The snap-on front cover is said to provide the biggest aero gains at over 40kph. It only hides the central four vents, but has a slot to channel some air through.

Internal channeling on the Tonic keeps air moving across the head, and probably reduces the weight a little, too. Ventilation is very good for a helmet at this price point — not as airy as something like the Prevail but much better than helmets in its class. Super-Fit - A great helmet is so comfortable that once it’s on, it virtually disappears. Giro’s proprietary three-size Super Fit system is based on “human scale factors” data and over 20 years of crafting helmets for the best bike riders in the world. The result is pure Skull Hugging Luxury, a helmet that fits 98% of the world’s population, yet looks (and fits) like it was custom made just for you. The shell contributes to its 325g weight, but provides extra protection from accidental damage, while inside the padding is made from Merino wool for super-soft comfort. Its MIPS system adds to the cost, but for that you are also getting great reassurance, and along with the super-adjustable Roc Loc 5 cradle is an excellent fit. Four internal pads keep things comfortable and five pronounced internal channels ventilate the majority of the head very well at all speeds, making this model an attractive, safe and great-value choice. The Foray Helmet shares the sleek styling of Giro’s premium cycling helmet, the Synthe, with a light, slim design that offers impressive ventilation and superb head protection at an affordable price.

Spec overview

Le Foray reprend les codes esthétiques de notre audacieux casque haut de gamme Synthe et offre de nombreuses fonctionnalités clés. Notamment avec la construction In-Mold durable et le système d'ajustement Roc Loc 5. Le design fin est très léger offre une excellente ventilation. Il est disponible en trois tailles parfaitement ajustées afin que vous puissiez obtenir un casque qui a de l'allure et vous va comme s’il avait été fabriqué sur-mesure. Les modèles Mips® sont disponibles avec le système de diffusion des forces exercées sur le casque en cas d’impact.

Notably, the Velocis comes with a one-year crash replacement policy: if you crash it in the first year, you get a free replacement. There are 32 vents in total, ranging from large inline strip vents and boxy exhaust ports to small square vents that punctuate the diagonal arch architecture of the helmet and extensive internal channelling helps keeps fresh air flowing. Performance

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Giro applies their latest technologies to deliver a bike helmet that is both superbly aerodynamic and comfortable. The fit and function are perfect whatever bike you ride too, from road to trail, fixie to fat-bike. The Foray Cycling Helmet is available in Giro’s Super Fit sizes so that you can get a helmet that looks, fits and feels like it was made for you. The industry benchmark in comfort, stability, adjustability and weight savings. In addition to enhancing the fit and comfort of helmets, Roc Loc® 5 allows you to easily custom tune the fit tension and the fore-aft tilt of the helmet in seconds using a single hand. And it’s lighter than comparable systems too, making it the ultimate in skull-hugging luxury. The ARX Plus is particularly impressive at the front, where its large internal channels and a well-vented brow prevent the build up of sweat. Vertical adjustment may be limited to three press-studs offering 20mm of adjustability, but it proved perfectly adequate in practice. The small rear dial offers true micro-adjustment, which helps get a precise fit. Adding MIPS increases the weight — the large now weighs 282g — but the increase is just 20g more than the standard ARX. And frankly, low weight is not the first thing we look for when it comes to safety. Wind Tunnel Ventilation - Giro helmets are developed utilising their proprietary Wind Tunnel™ ventilation system, which combines active vents with internal exhaust channels that thrust cool, fresh air over and around the rider’s head while forcing heat and stale air out. This significant increase in air channelling makes a difference that riders will immediately feel and appreciate.

This lid's aero emphasis means ventilation is reduced to a single central vent, which is helped by internal channels that begin at the brow. In normal conditions it's very comfortable, with a constant flow of air across the head and no obvious hot spots, but it probably wouldn't be our first choice for a summer Alpine assault. Specialized's rear Mindset adjusting cradle offers five height positions, well placed pads and a rotary dial. Older Specialized helmets used to be quite narrow, but now accommodate rounder heads very well with no squeezing or pinching. The straps are fixed by clasps at each side, but are ideally positioned to let the pliable chinstrap do its job. It's worth noting that this is an older version of the Velocis and we have the latest generation of the helmet in for test currently. Giro Foray MIPS helmet The Giro Foray MIPS pays more than a nod to Giro's range-topping Synthe aero helmet, with a smooth, rounded compact shell and truncated rear to maintain efficiency in all head positions. At almost any speed and head angle there's a remarkable through-flow of air. It also comes with plugs (for winter rides or even faster aerodynamics) that go into the five frontal ports.The Cadence Plus is Scott's aero road helmet solution. Its polycarbonate shell completely covers the vulnerable EPS core, apart from inside the vents, and its smooth, elongated shape and mostly enclosed shell look purposeful. Finance is subject to application, financial circumstances and borrowing history. Performance Cycling Limited FRN: 720557 trading as Tredz are authorised and regulated by the Financial Conduct Authority. We are a credit broker not a lender – credit is subject to status and affordability and is provided by Mitsubishi HC Capital UK PLC. Terms & Conditions Apply.

The fit should suit most head shapes, with the Mindset rear cradle offering plenty of vertical adjustment and the dial allowing you plenty of adjustability around the circumference of your head. Specialized S-Works Prevail The Rivale's shape is more rounded than most aero helmets. The internal padding is minimal yet well placed, and the micro-adjust dial offers plenty of tensioning to keep it securely on your head. We especially loved the 4cm vertical adjustment in the retaining cradle, which enables you to situate it in just the right spot. Giro helmets are developed utilizing our proprietary Wind Tunnel™ ventilation system. This elaborate design combines active vents in the helmet’s shell with exhaust channels inside the helmet that thrust fresh, cool air over and around the rider’s head while forcing heat and stale air out. It’s the most effective cooling system available, and a difference you can feel every time you ride. Beneath the shell is a heavily channelled EPS (expanded polystyrene) core that offers far more ventilation than your usual aero lid. The large base vents at the temple also feature textured grippers to hold your glasses when you're not wearing them. The Lazer Tonic is an excellent budget road helmet that looks and feels like a much more expensive lid. At 230g for a Medium, it weighs the same as helmets more than twice as expensive, such as the Specialized S-Works Prevail or the Bontrager Velocis.Chain reaction Cycles and CRC are trading names of Wiggle Ltd (In Administration) registered in the United Kingdom at 1000 Lakeside, Suite 310, Third Floor N E Wing, Portsmouth, Hampshire, PO6 3EN, Specialized has taken its ultra-aerodynamic S-Works Evade lid as the template for the Airnet, although it still has touches of the old leather ‘hairnet' helmets (hence the name) worn by racers from the 1970s. The MIPS system, or Multi- Directional Impact Protection System, employs a slim, flexible plastic cap that's perforated to match the helmet's vents, and four elastic fixings allow it to float within the inner EPS foam shell, creating a slip-plane, much like the brain's own, to slow or reduce rotational energy transfer. Kask Protone The ventilating aero mesh on either side of the silicone-edged sunglasses ports has been replaced by a finely ribbed plastic. The Giro logo and aero mesh covering the truncated tail's central port have gone too, and the only branding on the helmet is a single Rapha logo on the very top. That means they work with ponytails and/or particularly bony skulls, and it's a really neat, genuinely comfort-boosting feature for the price. It also keeps weight down to a reasonable 294g (for the medium).