You may forget you’re wearing a helmet with the sub-8-ounce Specialized S-Works Prevail, which is among the lightest on the market. Until you look in the mirror. It’s a bulky dome with a big profile that might make you self-conscious, but it’s worth the drop in style, with huge cooling vents that tame the heat. The Prevail gets away with this without adding weight by using a kevlar-reinforced inner matrix that yields structural support, like rebar in concrete, in lieu of extra foam. Lock in the fit with a dial on the back and hold your (considerably lighter) head high. ($250, specialized.com)
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