Full-coverage and thickly fleeced ear pads make BERN's G2 one of the warmest helmets we've tested. But remove the pads and crack the vents, and it's ready for the warmest spring days. Bonus: It's also lightweight and vented enough to double as your mountain-biking lid. The only bummer: you can't easily fine-tune the fit (there's no adjusting dial). $140; bernunlimited.com
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