Review: Specialized Prevail Helmet

The Kevlar-reinforced internal skeleton inside every Specialized S-Works Prevail helmet helped the company’s designers get away with massive vents that wouldn’t be possible with pure foam. The added structural support allowed them to shave away external foam to create massive ports and channels, which have a double benefit: They allow more cooling air to flow over the wearer’s head and also, according to Specialized, improve aerodynamics.

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