So the fact that the Oxford Raven is just £39.99 makes it a bargain, if the performance lives up to the spec on paper. Tester Dave writes: “If you asked me how much I'd be prepared to pay for a comfortable, well-ventilated helmet, with a good dial retention system and modern construction techniques, that weighs about 250g, I'd probably say that was about sixty quid's worth of hat, or more. Read our review of the Specialized S-Works Prevail II It's a neat system that offers some peace of mind."
When he tested it Mat Brett said "I set myself up as my own emergency contact just to test out ANGi, and I've been receiving all the start/finish ride alerts, while a 'test mode' function on the Ride app allows you to check that the device is detecting the various directional forces when you give it a shake. The ANGi crash sensor is now a £45 optional extra. The retention system provides plenty of adjustment at the rear." How it sits on you will depend on your head shape, but if you're looking for a bit of extra skull coverage, it could be a good option. On my head the Vent sits quite low, with the front rim dropping to just above my eyebrows. "The Vent keeps the Prevail II's comfort and is an easy lid to wear on longer rides. The results? A marginally more frozen head on a January morning with the Prevail II Vent than with the standard Prevail II. As well as plenty of vents at the front and back, there are now three huge vents at the top and sides instead of ten large ones, so with my hair calibrated for waft, I headed out to see if I could tell the difference.
GIRO HELIOS SPHERICAL REVIEW UPDATE
Tester Liam writes: "An update of Specialized's previous top-end helmet, the S-Works Prevail II Vent is cool, comfortable and fits very well, plus you still get the safety benefits of Mips and the optional ANGi technology should you have an off.
A recent innovation, Mips, is claimed to improve impact absorption in certain crashes and is becoming fairly common. To make helmets lighter manfufacturers use built-in reinforcing skeletons and lightweight components, which all pushes up the cost. In general, the more you pay, the less you get. Modern helmets make this fairly straightforward with dial adjusters at the back.
To provide any protection a helmet needs to to fit snugly take the time to fit it properly. Holes in the structure (the posh term is 'vents') allow air through to reduce overheating channels inside the shell give it somewhere to flow and produce comedy helmet hai.
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