The MET Strale is the brand’s latest helmet and has been designed around something called the Venturi effect — a fluid dynamic principle that says when a fluid hits a choke point its velocity will increase — and air enters the helmet through the vents at the front to be channelled through the helmet and out the back, which according to MET should speed up the ejection of hot humid air from the rear exhaust ports.
The MET Rival works on the same principal and when we reviewed the Rival last year, our tester was impressed by how well it worked, with the deep channels keeping the relatively closed lid airy.
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The Strale has only 14 vents, but each has decent channelling and a mostly unblocked path straight out the back of the helmet. It’s clear MET has opted for the quality not quantity approach to venting with this helmet, but does the venting stack up?
I’ve been using this helmet during the Australian summer, it been a hot one, and have definitely suffered from a sweaty head and experienced plenty of sweat dripping into my eyes and down my sunglasses while wearing this helmet. Despite it feeling as if there is good airflow passing over your head, especially at higher speeds, the Strale hardly competes with more open helmets like the Specialized Propero II, and some alternatives have double the number of vents and deeper channelling too.
I also found that unlike the larger vents at the top, the channelling under the brow of the helmet was almost completely blocked by the retention system and padding, which hampered flow coming in under the front.
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